12261631320 has 48 divisors (see below), whose sum is σ = 39850302960. Its totient is φ = 3269768256.

The previous prime is 12261631307. The next prime is 12261631337. The reversal of 12261631320 is 2313616221.

12261631320 is a `hidden beast` number, since 1 + 2 + 2 + 6 + 1 + 631 + 3 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17029684 + ... + 17030403.

It is an arithmetic number, because the mean of its divisors is an integer number (830214645).

Almost surely, 2^12261631320 is an apocalyptic number.

12261631320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12261631320 is an abundant number, since it is smaller than the sum of its proper divisors (27588671640).

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

12261631320 is a wasteful number, since it uses less digits than its factorization.

12261631320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34060104 (or 34060097 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The spelling of 12261631320 in words is "twelve billion, two hundred sixty-one million, six hundred thirty-one thousand, three hundred twenty".