12630436581 has 16 divisors (see below), whose sum is σ = 19248023168. Its totient is φ = 7216776000.

The previous prime is 12630436573. The next prime is 12630436601. The reversal of 12630436581 is 18563403621.

It is not a de Polignac number, because 12630436581 - 2³ = 12630436573 is a prime.

It is a super-2 number, since 2×12630436581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12630436081) 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, 362631 + ... + 395931.

It is an arithmetic number, because the mean of its divisors is an integer number (1203001448).

Almost surely, 2^12630436581 is an apocalyptic number.

It is an amenable number.

12630436581 is a deficient number, since it is larger than the sum of its proper divisors (6617586587).

12630436581 is a wasteful number, since it uses less digits than its factorization.

12630436581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51372.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 12630436581 in words is "twelve billion, six hundred thirty million, four hundred thirty-six thousand, five hundred eighty-one".