261691040862 has 24 divisors (see below), whose sum is σ = 567392982624. Its totient is φ = 87169465824.

The previous prime is 261691040857. The next prime is 261691040903. The reversal of 261691040862 is 268040196162.

261691040862 is a `hidden beast` number, since 26 + 169 + 1 + 0 + 408 + 62 = 666.

It is a congruent number.

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, 5046918 + ... + 5098505.

It is an arithmetic number, because the mean of its divisors is an integer number (23641374276).

Almost surely, 2^261691040862 is an apocalyptic number.

261691040862 is an abundant number, since it is smaller than the sum of its proper divisors (305701941762).

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

261691040862 is a wasteful number, since it uses less digits than its factorization.

261691040862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10146864 (or 10146861 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 261691040862 in words is "two hundred sixty-one billion, six hundred ninety-one million, forty thousand, eight hundred sixty-two".