86538659521 has 16 divisors (see below), whose sum is σ = 88557552720. Its totient is φ = 84549104640.

The previous prime is 86538659509. The next prime is 86538659527. The reversal of 86538659521 is 12595683568.

It can be written as a sum of positive squares in 8 ways, for example, as 8711608896 + 77827050625 = 93336^2 + 278975^2 .

It is a cyclic number.

It is not a de Polignac number, because 86538659521 - 2⁷ = 86538659393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86538659527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2512005 + ... + 2546221.

It is an arithmetic number, because the mean of its divisors is an integer number (5534847045).

Almost surely, 2^86538659521 is an apocalyptic number.

It is an amenable number.

86538659521 is a deficient number, since it is larger than the sum of its proper divisors (2018893199).

86538659521 is a wasteful number, since it uses less digits than its factorization.

86538659521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34644.

The product of its digits is 15552000, while the sum is 58.

The spelling of 86538659521 in words is "eighty-six billion, five hundred thirty-eight million, six hundred fifty-nine thousand, five hundred twenty-one".