261706594780 has 24 divisors (see below), whose sum is σ = 549603098352. Its totient is φ = 104678971392.

The previous prime is 261706594771. The next prime is 261706594811. The reversal of 261706594780 is 87495607162.

It is a congruent number.

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, 397999 + ... + 825721.

It is an arithmetic number, because the mean of its divisors is an integer number (22900129098).

Almost surely, 2^261706594780 is an apocalyptic number.

261706594780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261706594780 is an abundant number, since it is smaller than the sum of its proper divisors (287896503572).

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

261706594780 is a wasteful number, since it uses less digits than its factorization.

261706594780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458325 (or 458323 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 261706594780 in words is "two hundred sixty-one billion, seven hundred six million, five hundred ninety-four thousand, seven hundred eighty".