261552373055154 has 96 divisors (see below), whose sum is σ = 568589287641024. Its totient is φ = 86893423505280.

The previous prime is 261552373055147. The next prime is 261552373055161. The reversal of 261552373055154 is 451550373255162.

261552373055154 is a `hidden beast` number, since 2 + 6 + 1 + 5 + 5 + 2 + 3 + 7 + 30 + 551 + 54 = 666.

It is an interprime number because it is at equal distance from previous prime (261552373055147) and next prime (261552373055161).

It is a self number, because there is not a number n which added to its sum of digits gives 261552373055154.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55378437837 + ... + 55378442559.

It is an arithmetic number, because the mean of its divisors is an integer number (5922805079594).

Almost surely, 2^{261552373055154} is an apocalyptic number.

261552373055154 is an abundant number, since it is smaller than the sum of its proper divisors (307036914585870).

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

261552373055154 is a wasteful number, since it uses less digits than its factorization.

261552373055154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10632 (or 10629 counting only the distinct ones).

The product of its (nonzero) digits is 18900000, while the sum is 54.

The spelling of 261552373055154 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, three hundred seventy-three million, fifty-five thousand, one hundred fifty-four".