12667722520 has 32 divisors (see below), whose sum is σ = 28647075600. Its totient is φ = 5041364608.

The previous prime is 12667722511. The next prime is 12667722521. The reversal of 12667722520 is 2522776621.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12667722521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795910 + ... + 811669.

Almost surely, 2^12667722520 is an apocalyptic number.

12667722520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12667722520 is an abundant number, since it is smaller than the sum of its proper divisors (15979353080).

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

12667722520 is a wasteful number, since it uses less digits than its factorization.

12667722520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607787 (or 1607783 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 12667722520 in words is "twelve billion, six hundred sixty-seven million, seven hundred twenty-two thousand, five hundred twenty".