621663534495 has 12 divisors (see below), whose sum is σ = 1077550126536. Its totient is φ = 331553885040.

The previous prime is 621663534469. The next prime is 621663534497. The reversal of 621663534495 is 594435366126.

621663534495 is a `hidden beast` number, since 6 + 2 + 1 + 6 + 63 + 534 + 49 + 5 = 666.

It is not a de Polignac number, because 621663534495 - 2⁹ = 621663533983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621663534497) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6907372561 + ... + 6907372650.

It is an arithmetic number, because the mean of its divisors is an integer number (89795843878).

Almost surely, 2^621663534495 is an apocalyptic number.

621663534495 is a deficient number, since it is larger than the sum of its proper divisors (455886592041).

621663534495 is a wasteful number, since it uses less digits than its factorization.

621663534495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13814745222 (or 13814745219 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 54.

The spelling of 621663534495 in words is "six hundred twenty-one billion, six hundred sixty-three million, five hundred thirty-four thousand, four hundred ninety-five".