261676064570564 has 48 divisors (see below), whose sum is σ = 542078260018176. Its totient is φ = 108158836291200.

The previous prime is 261676064570449. The next prime is 261676064570603. The reversal of 261676064570564 is 465075460676162.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 261676064570564.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 514199807 + ... + 514708454.

It is an arithmetic number, because the mean of its divisors is an integer number (11293297083712).

Almost surely, 2^{261676064570564} is an apocalyptic number.

It is an amenable number.

261676064570564 is an abundant number, since it is smaller than the sum of its proper divisors (280402195447612).

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

261676064570564 is a wasteful number, since it uses less digits than its factorization.

261676064570564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028908596 (or 1028908594 counting only the distinct ones).

The product of its (nonzero) digits is 304819200, while the sum is 65.

The spelling of 261676064570564 in words is "two hundred sixty-one trillion, six hundred seventy-six billion, sixty-four million, five hundred seventy thousand, five hundred sixty-four".