261421765176512 has 112 divisors (see below), whose sum is σ = 579793754304000. Its totient is φ = 116222517448704.

The previous prime is 261421765176499. The next prime is 261421765176641. The reversal of 261421765176512 is 215671567124162.

It is a super-2 number, since 2×261421765176512² (a number of 30 digits) contains 22 as substring.

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, 10191812 + ... + 25034307.

Almost surely, 2^{261421765176512} is an apocalyptic number.

It is an amenable number.

261421765176512 is an abundant number, since it is smaller than the sum of its proper divisors (318371989127488).

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

261421765176512 is a wasteful number, since it uses less digits than its factorization.

261421765176512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35226526 (or 35226516 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 56.

The spelling of 261421765176512 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, seven hundred sixty-five million, one hundred seventy-six thousand, five hundred twelve".