71679250521 has 12 divisors (see below), whose sum is σ = 103543665940. Its totient is φ = 47782949760.

The previous prime is 71679250507. The next prime is 71679250549. The reversal of 71679250521 is 12505297617.

71679250521 is a `hidden beast` number, since 7 + 1 + 6 + 79 + 2 + 50 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17315664921 + 54363585600 = 131589^2 + 233160^2 .

It is not a de Polignac number, because 71679250521 - 2⁶ = 71679250457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71679250121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122860 + ... + 398061.

Almost surely, 2^71679250521 is an apocalyptic number.

It is an amenable number.

71679250521 is a deficient number, since it is larger than the sum of its proper divisors (31864415419).

71679250521 is a wasteful number, since it uses less digits than its factorization.

71679250521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536216 (or 536213 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 45.

The spelling of 71679250521 in words is "seventy-one billion, six hundred seventy-nine million, two hundred fifty thousand, five hundred twenty-one".