261534689252 has 6 divisors (see below), whose sum is σ = 457685706198. Its totient is φ = 130767344624.

The previous prime is 261534689191. The next prime is 261534689257. The reversal of 261534689252 is 252986435162.

It can be written as a sum of positive squares in only one way, i.e., 200967510436 + 60567178816 = 448294^2 + 246104^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261534689194 and 261534689203.

It is not an unprimeable number, because it can be changed into a prime (261534689257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32691836153 + ... + 32691836160.

It is an arithmetic number, because the mean of its divisors is an integer number (76280951033).

Almost surely, 2^261534689252 is an apocalyptic number.

It is an amenable number.

261534689252 is a deficient number, since it is larger than the sum of its proper divisors (196151016946).

261534689252 is a wasteful number, since it uses less digits than its factorization.

261534689252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65383672317 (or 65383672315 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 53.

The spelling of 261534689252 in words is "two hundred sixty-one billion, five hundred thirty-four million, six hundred eighty-nine thousand, two hundred fifty-two".