12520501620 has 72 divisors (see below), whose sum is σ = 38534194272. Its totient is φ = 3035271360.

The previous prime is 12520501601. The next prime is 12520501621. The reversal of 12520501620 is 2610502521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520501621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 855034 + ... + 869553.

Almost surely, 2^12520501620 is an apocalyptic number.

12520501620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12520501620 is an abundant number, since it is smaller than the sum of its proper divisors (26013692652).

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

12520501620 is a wasteful number, since it uses less digits than its factorization.

12520501620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724621 (or 1724608 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Subtracting from 12520501620 its reverse (2610502521), we obtain a palindrome (9909999099).

The spelling of 12520501620 in words is "twelve billion, five hundred twenty million, five hundred one thousand, six hundred twenty".