621450973551 has 16 divisors (see below), whose sum is σ = 844355280384. Its totient is φ = 406425880224.

The previous prime is 621450973529. The next prime is 621450973567. The reversal of 621450973551 is 155379054126.

621450973551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621450973551 - 2¹¹ = 621450971503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621450973551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621450973571) 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, 858990 + ... + 1407396.

It is an arithmetic number, because the mean of its divisors is an integer number (52772205024).

Almost surely, 2^621450973551 is an apocalyptic number.

621450973551 is a deficient number, since it is larger than the sum of its proper divisors (222904306833).

621450973551 is a wasteful number, since it uses less digits than its factorization.

621450973551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555590.

The product of its (nonzero) digits is 1134000, while the sum is 48.

The spelling of 621450973551 in words is "six hundred twenty-one billion, four hundred fifty million, nine hundred seventy-three thousand, five hundred fifty-one".