261204656 has 40 divisors (see below), whose sum is σ = 512248464. Its totient is φ = 129024000.

The previous prime is 261204641. The next prime is 261204683. The reversal of 261204656 is 656402162.

261204656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 774920 + ... + 775256.

Almost surely, 2^261204656 is an apocalyptic number.

It is an amenable number.

261204656 is a deficient number, since it is larger than the sum of its proper divisors (251043808).

261204656 is a wasteful number, since it uses less digits than its factorization.

261204656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 261204656 is about 16161.8271244312. The cubic root of 261204656 is about 639.2346449977.

The spelling of 261204656 in words is "two hundred sixty-one million, two hundred four thousand, six hundred fifty-six".