261138758600 has 48 divisors (see below), whose sum is σ = 620065670400. Its totient is φ = 102233042240.

The previous prime is 261138758561. The next prime is 261138758611. The reversal of 261138758600 is 6857831162.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13880960 + ... + 13899759.

It is an arithmetic number, because the mean of its divisors is an integer number (12918034800).

Almost surely, 2^261138758600 is an apocalyptic number.

261138758600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261138758600 is an abundant number, since it is smaller than the sum of its proper divisors (358926911800).

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

261138758600 is a wasteful number, since it uses less digits than its factorization.

261138758600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27780782 (or 27780773 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 261138758600 in words is "two hundred sixty-one billion, one hundred thirty-eight million, seven hundred fifty-eight thousand, six hundred".