12621562464 has 192 divisors, whose sum is σ = 38720747520. Its totient is φ = 3525150720.

The previous prime is 12621562417. The next prime is 12621562493. The reversal of 12621562464 is 46426512621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13854169 + ... + 13855079.

It is an arithmetic number, because the mean of its divisors is an integer number (201670560).

Almost surely, 2^12621562464 is an apocalyptic number.

12621562464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12621562464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19360373760).

12621562464 is an abundant number, since it is smaller than the sum of its proper divisors (26099185056).

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

12621562464 is a wasteful number, since it uses less digits than its factorization.

12621562464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373 (or 1365 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The spelling of 12621562464 in words is "twelve billion, six hundred twenty-one million, five hundred sixty-two thousand, four hundred sixty-four".