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206440655330 = 257131787126949
BaseRepresentation
bin1100000001000011010…
…0100110100111100010
3201201212012111212122102
43000100310212213202
511340242301432310
6234500523410402
720625535421540
oct3002064464742
9651765455572
10206440655330
117a607405948
1234014683a02
131660c792430
149dc5638d90
155583b018a5
hex3010d269e2

206440655330 has 64 divisors (see below), whose sum is σ = 457604985600. Its totient is φ = 65297988864.

The previous prime is 206440655299. The next prime is 206440655353. The reversal of 206440655330 is 33556044602.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1562696 + ... + 1689644.

It is an arithmetic number, because the mean of its divisors is an integer number (7150077900).

Almost surely, 2206440655330 is an apocalyptic number.

206440655330 is an abundant number, since it is smaller than the sum of its proper divisors (251164330270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206440655330 is a wasteful number, since it uses less digits than its factorization.

206440655330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128763.

The product of its (nonzero) digits is 259200, while the sum is 38.

Adding to 206440655330 its reverse (33556044602), we get a palindrome (239996699932).

The spelling of 206440655330 in words is "two hundred six billion, four hundred forty million, six hundred fifty-five thousand, three hundred thirty".

Divisors: 1 2 5 7 10 13 14 26 35 65 70 91 130 182 455 910 1787 3574 8935 12509 17870 23231 25018 46462 62545 116155 125090 126949 162617 232310 253898 325234 634745 813085 888643 1269490 1626170 1650337 1777286 3300674 4443215 8251685 8886430 11552359 16503370 23104718 57761795 115523590 226857863 453715726 1134289315 1588005041 2268578630 2949152219 3176010082 5898304438 7940025205 14745761095 15880050410 20644065533 29491522190 41288131066 103220327665 206440655330