261533660100534 has 12 divisors (see below), whose sum is σ = 566656263551196. Its totient is φ = 87177886700172.

The previous prime is 261533660100451. The next prime is 261533660100593. The reversal of 261533660100534 is 435001066335162.

261533660100534 is a `hidden beast` number, since 2 + 6 + 1 + 5 + 3 + 3 + 6 + 6 + 0 + 100 + 534 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 261533660100534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7264823891664 + ... + 7264823891699.

It is an arithmetic number, because the mean of its divisors is an integer number (47221355295933).

Almost surely, 2^{261533660100534} is an apocalyptic number.

261533660100534 is an abundant number, since it is smaller than the sum of its proper divisors (305122603450662).

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

261533660100534 is a wasteful number, since it uses less digits than its factorization.

261533660100534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14529647783371 (or 14529647783368 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 261533660100534 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, six hundred sixty million, one hundred thousand, five hundred thirty-four".