261615073904 has 40 divisors (see below), whose sum is σ = 533626002000. Its totient is φ = 123906917376.

The previous prime is 261615073877. The next prime is 261615073933. The reversal of 261615073904 is 409370516162.

It is a congruent number.

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, 2492762 + ... + 2595590.

It is an arithmetic number, because the mean of its divisors is an integer number (13340650050).

Almost surely, 2^261615073904 is an apocalyptic number.

It is an amenable number.

261615073904 is an abundant number, since it is smaller than the sum of its proper divisors (272010928096).

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

261615073904 is a wasteful number, since it uses less digits than its factorization.

261615073904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111225 (or 111219 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 261615073904 in words is "two hundred sixty-one billion, six hundred fifteen million, seventy-three thousand, nine hundred four".