12661421464624 has 40 divisors (see below), whose sum is σ = 25360787864720. Its totient is φ = 6119737602048.

The previous prime is 12661421464609. The next prime is 12661421464649. The reversal of 12661421464624 is 42646412416621.

It is a super-2 number, since 2×12661421464624² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94795269 + ... + 94928740.

It is an arithmetic number, because the mean of its divisors is an integer number (634019696618).

Almost surely, 2^{12661421464624} is an apocalyptic number.

It is an amenable number.

12661421464624 is an abundant number, since it is smaller than the sum of its proper divisors (12699366400096).

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

12661421464624 is a wasteful number, since it uses less digits than its factorization.

12661421464624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189724157 (or 189724151 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 49.

The spelling of 12661421464624 in words is "twelve trillion, six hundred sixty-one billion, four hundred twenty-one million, four hundred sixty-four thousand, six hundred twenty-four".