261563340660776 has 48 divisors (see below), whose sum is σ = 622365462714240. Its totient is φ = 101907795060960.

The previous prime is 261563340660761. The next prime is 261563340660781. The reversal of 261563340660776 is 677066043365162.

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, 30329696600 + ... + 30329705223.

It is an arithmetic number, because the mean of its divisors is an integer number (12965947139880).

Almost surely, 2^{261563340660776} is an apocalyptic number.

It is an amenable number.

261563340660776 is an abundant number, since it is smaller than the sum of its proper divisors (360802122053464).

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

261563340660776 is a wasteful number, since it uses less digits than its factorization.

261563340660776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60659401854 (or 60659401843 counting only the distinct ones).

The product of its (nonzero) digits is 137168640, while the sum is 62.

The spelling of 261563340660776 in words is "two hundred sixty-one trillion, five hundred sixty-three billion, three hundred forty million, six hundred sixty thousand, seven hundred seventy-six".