12261651320637 has 48 divisors (see below), whose sum is σ = 18238514810880. Its totient is φ = 7933224499200.

The previous prime is 12261651320599. The next prime is 12261651320641. The reversal of 12261651320637 is 73602315616221.

12261651320637 is a `hidden beast` number, since 1 + 2 + 2 + 6 + 1 + 6 + 5 + 1 + 3 + 2 + 0 + 637 = 666.

It is not a de Polignac number, because 12261651320637 - 2²³ = 12261642932029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12261651320592 and 12261651320601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261651320437) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157002564 + ... + 157080642.

It is an arithmetic number, because the mean of its divisors is an integer number (379969058560).

Almost surely, 2^{12261651320637} is an apocalyptic number.

It is an amenable number.

12261651320637 is a deficient number, since it is larger than the sum of its proper divisors (5976863490243).

12261651320637 is a wasteful number, since it uses less digits than its factorization.

12261651320637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80354 (or 80351 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

Adding to 12261651320637 its reverse (73602315616221), we get a palindrome (85863966936858).

The spelling of 12261651320637 in words is "twelve trillion, two hundred sixty-one billion, six hundred fifty-one million, three hundred twenty thousand, six hundred thirty-seven".