261655436774522 has 64 divisors (see below), whose sum is σ = 451752729292800. Its totient is φ = 111340509261696.

The previous prime is 261655436774513. The next prime is 261655436774527. The reversal of 261655436774522 is 225477634556162.

It is not an unprimeable number, because it can be changed into a prime (261655436774527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2681478998 + ... + 2681576574.

It is an arithmetic number, because the mean of its divisors is an integer number (7058636395200).

Almost surely, 2^{261655436774522} is an apocalyptic number.

261655436774522 is a deficient number, since it is larger than the sum of its proper divisors (190097292518278).

261655436774522 is a wasteful number, since it uses less digits than its factorization.

261655436774522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99795.

The product of its digits is 508032000, while the sum is 65.

The spelling of 261655436774522 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, four hundred thirty-six million, seven hundred seventy-four thousand, five hundred twenty-two".