261631164372 has 24 divisors (see below), whose sum is σ = 610579658976. Its totient is φ = 87195110688.

The previous prime is 261631164307. The next prime is 261631164397. The reversal of 261631164372 is 273461136162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1838218 + ... + 1975425.

It is an arithmetic number, because the mean of its divisors is an integer number (25440819124).

Almost surely, 2^261631164372 is an apocalyptic number.

It is an amenable number.

261631164372 is an abundant number, since it is smaller than the sum of its proper divisors (348948494604).

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

261631164372 is a wasteful number, since it uses less digits than its factorization.

261631164372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3819367 (or 3819365 counting only the distinct ones).

The product of its digits is 217728, while the sum is 42.

The spelling of 261631164372 in words is "two hundred sixty-one billion, six hundred thirty-one million, one hundred sixty-four thousand, three hundred seventy-two".