261715390404 has 96 divisors (see below), whose sum is σ = 674506635264. Its totient is φ = 78471711360.

The previous prime is 261715390399. The next prime is 261715390421. The reversal of 261715390404 is 404093517162.

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, 2845887 + ... + 2936409.

It is an arithmetic number, because the mean of its divisors is an integer number (7026110784).

Almost surely, 2^261715390404 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 261715390404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337253317632).

261715390404 is an abundant number, since it is smaller than the sum of its proper divisors (412791244860).

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

261715390404 is a wasteful number, since it uses less digits than its factorization.

261715390404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91017 (or 91015 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 261715390404 in words is "two hundred sixty-one billion, seven hundred fifteen million, three hundred ninety thousand, four hundred four".