261671597916 has 48 divisors (see below), whose sum is σ = 646253112960. Its totient is φ = 82176586560.

The previous prime is 261671597909. The next prime is 261671597917. The reversal of 261671597916 is 619795176162.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 261671597916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261671597917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3129126 + ... + 3211661.

It is an arithmetic number, because the mean of its divisors is an integer number (13463606520).

Almost surely, 2^261671597916 is an apocalyptic number.

It is an amenable number.

261671597916 is an abundant number, since it is smaller than the sum of its proper divisors (384581515044).

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

261671597916 is a wasteful number, since it uses less digits than its factorization.

261671597916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6340994 (or 6340992 counting only the distinct ones).

The product of its digits is 8573040, while the sum is 60.

The spelling of 261671597916 in words is "two hundred sixty-one billion, six hundred seventy-one million, five hundred ninety-seven thousand, nine hundred sixteen".