261432072061155 has 12 divisors (see below), whose sum is σ = 453148924906080. Its totient is φ = 139430438432592.

The previous prime is 261432072061117. The next prime is 261432072061169. The reversal of 261432072061155 is 551160270234162.

261432072061155 is a `hidden beast` number, since 2 + 6 + 1 + 4 + 3 + 2 + 0 + 7 + 20 + 611 + 5 + 5 = 666.

It is not a de Polignac number, because 261432072061155 - 2⁸ = 261432072060899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 5809601601359 = 261432072061155 / (2 + 6 + 1 + 4 + 3 + 2 + 0 + 7 + 2 + 0 + 6 + 1 + 1 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 261432072061155.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2904800800635 + ... + 2904800800724.

It is an arithmetic number, because the mean of its divisors is an integer number (37762410408840).

Almost surely, 2^{261432072061155} is an apocalyptic number.

261432072061155 is a deficient number, since it is larger than the sum of its proper divisors (191716852844925).

261432072061155 is a wasteful number, since it uses less digits than its factorization.

261432072061155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5809601601370 (or 5809601601367 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 261432072061155 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, seventy-two million, sixty-one thousand, one hundred fifty-five".