261596138832 has 60 divisors (see below), whose sum is σ = 836692415520. Its totient is φ = 74741753664.

The previous prime is 261596138809. The next prime is 261596138857. The reversal of 261596138832 is 238831695162.

261596138832 is a `hidden beast` number, since 2 + 6 + 1 + 596 + 13 + 8 + 8 + 32 = 666.

It is a super-2 number, since 2×261596138832² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129758982 + ... + 129760997.

It is an arithmetic number, because the mean of its divisors is an integer number (13944873592).

Almost surely, 2^261596138832 is an apocalyptic number.

It is an amenable number.

261596138832 is an abundant number, since it is smaller than the sum of its proper divisors (575096276688).

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

261596138832 is a wasteful number, since it uses less digits than its factorization.

261596138832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259520000 (or 259519991 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 261596138832 in words is "two hundred sixty-one billion, five hundred ninety-six million, one hundred thirty-eight thousand, eight hundred thirty-two".