261772944285696 has 448 divisors, whose sum is σ = 709499393596800. Its totient is φ = 85836888539136.

The previous prime is 261772944285599. The next prime is 261772944285709. The reversal of 261772944285696 is 696582449277162.

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, 354225905295 + ... + 354225906033.

Almost surely, 2^{261772944285696} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261772944285696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354749696798400).

261772944285696 is an abundant number, since it is smaller than the sum of its proper divisors (447726449311104).

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

261772944285696 is a wasteful number, since it uses less digits than its factorization.

261772944285696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 1643 counting only the distinct ones).

The product of its digits is 4389396480, while the sum is 78.

The spelling of 261772944285696 in words is "two hundred sixty-one trillion, seven hundred seventy-two billion, nine hundred forty-four million, two hundred eighty-five thousand, six hundred ninety-six".