261340564494 has 64 divisors (see below), whose sum is σ = 557686321920. Its totient is φ = 81358794240.

The previous prime is 261340564481. The next prime is 261340564501. The reversal of 261340564494 is 494465043162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42006304 + ... + 42012524.

It is an arithmetic number, because the mean of its divisors is an integer number (8713848780).

Almost surely, 2^261340564494 is an apocalyptic number.

261340564494 is an abundant number, since it is smaller than the sum of its proper divisors (296345757426).

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

261340564494 is a wasteful number, since it uses less digits than its factorization.

261340564494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9345.

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 261340564494 in words is "two hundred sixty-one billion, three hundred forty million, five hundred sixty-four thousand, four hundred ninety-four".