261569513796 has 24 divisors (see below), whose sum is σ = 646230564000. Its totient is φ = 82061023872.

The previous prime is 261569513771. The next prime is 261569513797. The reversal of 261569513796 is 697315965162.

It is a super-2 number, since 2×261569513796² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261569513797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641101546 + ... + 641101953.

It is an arithmetic number, because the mean of its divisors is an integer number (26926273500).

Almost surely, 2^261569513796 is an apocalyptic number.

It is an amenable number.

261569513796 is an abundant number, since it is smaller than the sum of its proper divisors (384661050204).

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

261569513796 is a wasteful number, since it uses less digits than its factorization.

261569513796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282203523 (or 1282203521 counting only the distinct ones).

The product of its digits is 18370800, while the sum is 60.

The spelling of 261569513796 in words is "two hundred sixty-one billion, five hundred sixty-nine million, five hundred thirteen thousand, seven hundred ninety-six".