261431265604672 has 28 divisors (see below), whose sum is σ = 518902404367360. Its totient is φ = 130684203086976.

The previous prime is 261431265604631. The next prime is 261431265604681. The reversal of 261431265604672 is 276406562134162.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490821048 + ... + 491353399.

Almost surely, 2^{261431265604672} is an apocalyptic number.

It is an amenable number.

261431265604672 is a deficient number, since it is larger than the sum of its proper divisors (257471138762688).

261431265604672 is an equidigital number, since it uses as much as digits as its factorization.

261431265604672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982178618 (or 982178608 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 55.

The spelling of 261431265604672 in words is "two hundred sixty-one trillion, four hundred thirty-one billion, two hundred sixty-five million, six hundred four thousand, six hundred seventy-two".