261370256460 has 24 divisors (see below), whose sum is σ = 731836718256. Its totient is φ = 69698735040.

The previous prime is 261370256437. The next prime is 261370256479. The reversal of 261370256460 is 64652073162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2178085411 + ... + 2178085530.

It is an arithmetic number, because the mean of its divisors is an integer number (30493196594).

Almost surely, 2^261370256460 is an apocalyptic number.

261370256460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261370256460 is an abundant number, since it is smaller than the sum of its proper divisors (470466461796).

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

261370256460 is a wasteful number, since it uses less digits than its factorization.

261370256460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4356170953 (or 4356170951 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 261370256460 in words is "two hundred sixty-one billion, three hundred seventy million, two hundred fifty-six thousand, four hundred sixty".