12646534621 has 16 divisors (see below), whose sum is σ = 15022675584. Its totient is φ = 10419827904.

The previous prime is 12646534619. The next prime is 12646534631. The reversal of 12646534621 is 12643564621.

It is a cyclic number.

It is not a de Polignac number, because 12646534621 - 2¹ = 12646534619 is a prime.

It is a super-2 number, since 2×12646534621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12646534601) 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, 272650 + ... + 315643.

It is an arithmetic number, because the mean of its divisors is an integer number (938917224).

Almost surely, 2^12646534621 is an apocalyptic number.

It is an amenable number.

12646534621 is a deficient number, since it is larger than the sum of its proper divisors (2376140963).

12646534621 is an equidigital number, since it uses as much as digits as its factorization.

12646534621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588420.

The product of its digits is 207360, while the sum is 40.

The spelling of 12646534621 in words is "twelve billion, six hundred forty-six million, five hundred thirty-four thousand, six hundred twenty-one".