261552373055163 has 64 divisors (see below), whose sum is σ = 390440736000000. Its totient is φ = 173044295424000.

The previous prime is 261552373055161. The next prime is 261552373055173. The reversal of 261552373055163 is 361550373255162.

261552373055163 is a `hidden beast` number, since 2 + 6 + 1 + 5 + 5 + 23 + 7 + 3 + 0 + 551 + 63 = 666.

It is not a de Polignac number, because 261552373055163 - 2¹ = 261552373055161 is a prime.

It is a super-2 number, since 2×261552373055163² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261552373055161) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2187765913 + ... + 2187885461.

It is an arithmetic number, because the mean of its divisors is an integer number (6100636500000).

Almost surely, 2^{261552373055163} is an apocalyptic number.

261552373055163 is a deficient number, since it is larger than the sum of its proper divisors (128888362944837).

261552373055163 is a wasteful number, since it uses less digits than its factorization.

261552373055163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120977 (or 120971 counting only the distinct ones).

The product of its (nonzero) digits is 17010000, while the sum is 54.

The spelling of 261552373055163 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, three hundred seventy-three million, fifty-five thousand, one hundred sixty-three".