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68211712038391 = 206518133029411
BaseRepresentation
bin11111000001001110001101…
…10111011001010111110111
322221111222100111022210121121
433200213012313121113313
532420040041240212031
6401024010010124411
720240063545535335
oct1740470667312767
9287458314283547
1068211712038391
111a809474196309
127797a78420707
132c0a44c081b3c
1412bb670756b55
157d45232cb011
hex3e09c6dd95f7

68211712038391 has 4 divisors (see below), whose sum is σ = 68211747132984. Its totient is φ = 68211676943800.

The previous prime is 68211712038373. The next prime is 68211712038413. The reversal of 68211712038391 is 19383021711286.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68211712038391 - 237 = 68074273084919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68211712038311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14449525 + ... + 18579886.

It is an arithmetic number, because the mean of its divisors is an integer number (17052936783246).

Almost surely, 268211712038391 is an apocalyptic number.

68211712038391 is a deficient number, since it is larger than the sum of its proper divisors (35094593).

68211712038391 is a wasteful number, since it uses less digits than its factorization.

68211712038391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35094592.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 68211712038391 in words is "sixty-eight trillion, two hundred eleven billion, seven hundred twelve million, thirty-eight thousand, three hundred ninety-one".

Divisors: 1 2065181 33029411 68211712038391