261432135116506 has 32 divisors (see below), whose sum is σ = 411728556421440. Its totient is φ = 124323934686336.

The previous prime is 261432135116489. The next prime is 261432135116561. The reversal of 261432135116506 is 605611531234162.

It is a super-2 number, since 2×261432135116506² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 855338446 + ... + 855644038.

It is an arithmetic number, because the mean of its divisors is an integer number (12866517388170).

Almost surely, 2^{261432135116506} is an apocalyptic number.

261432135116506 is a deficient number, since it is larger than the sum of its proper divisors (150296421304934).

261432135116506 is a wasteful number, since it uses less digits than its factorization.

261432135116506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525838.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 261432135116506 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, one hundred thirty-five million, one hundred sixteen thousand, five hundred six".