261139488304 has 20 divisors (see below), whose sum is σ = 506031183360. Its totient is φ = 130550795840.

The previous prime is 261139488271. The next prime is 261139488329. The reversal of 261139488304 is 403884931162.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070239 + ... + 1291390.

It is an arithmetic number, because the mean of its divisors is an integer number (25301559168).

Almost surely, 2^261139488304 is an apocalyptic number.

It is an amenable number.

261139488304 is a deficient number, since it is larger than the sum of its proper divisors (244891695056).

261139488304 is a wasteful number, since it uses less digits than its factorization.

261139488304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368548 (or 2368542 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 261139488304 in words is "two hundred sixty-one billion, one hundred thirty-nine million, four hundred eighty-eight thousand, three hundred four".