261313566155016 has 32 divisors (see below), whose sum is σ = 653357741652000. Its totient is φ = 87094678549760.

The previous prime is 261313566154999. The next prime is 261313566155023. The reversal of 261313566155016 is 610551665313162.

It is a self number, because there is not a number n which added to its sum of digits gives 261313566155016.

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, 615002070 + ... + 615426821.

It is an arithmetic number, because the mean of its divisors is an integer number (20417429426625).

Almost surely, 2^{261313566155016} is an apocalyptic number.

It is an amenable number.

261313566155016 is an abundant number, since it is smaller than the sum of its proper divisors (392044175496984).

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

261313566155016 is a wasteful number, since it uses less digits than its factorization.

261313566155016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230437749 (or 1230437745 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 51.

The spelling of 261313566155016 in words is "two hundred sixty-one trillion, three hundred thirteen billion, five hundred sixty-six million, one hundred fifty-five thousand, sixteen".