261646204763044 has 24 divisors (see below), whose sum is σ = 464339280984768. Its totient is φ = 128977913342880.

The previous prime is 261646204763017. The next prime is 261646204763063. The reversal of 261646204763044 is 440367402646162.

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, 4774222 + ... + 23368474.

It is an arithmetic number, because the mean of its divisors is an integer number (19347470041032).

Almost surely, 2^{261646204763044} is an apocalyptic number.

It is an amenable number.

261646204763044 is a deficient number, since it is larger than the sum of its proper divisors (202693076221724).

261646204763044 is a wasteful number, since it uses less digits than its factorization.

261646204763044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18643875 (or 18643873 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 55.

The spelling of 261646204763044 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred four million, seven hundred sixty-three thousand, forty-four".