621444877445 has 48 divisors (see below), whose sum is σ = 901451386368. Its totient is φ = 402684441600.

The previous prime is 621444877433. The next prime is 621444877483. The reversal of 621444877445 is 544778444126.

It is not a de Polignac number, because 621444877445 - 2²⁰ = 621443828869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1158845 + ... + 1608045.

It is an arithmetic number, because the mean of its divisors is an integer number (18780237216).

Almost surely, 2^621444877445 is an apocalyptic number.

It is an amenable number.

621444877445 is a deficient number, since it is larger than the sum of its proper divisors (280006508923).

621444877445 is a wasteful number, since it uses less digits than its factorization.

621444877445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449318 (or 449289 counting only the distinct ones).

The product of its digits is 24084480, while the sum is 56.

The spelling of 621444877445 in words is "six hundred twenty-one billion, four hundred forty-four million, eight hundred seventy-seven thousand, four hundred forty-five".