621655013456 has 40 divisors (see below), whose sum is σ = 1276849526400. Its totient is φ = 292189689344.

The previous prime is 621655013393. The next prime is 621655013467. The reversal of 621655013456 is 654310556126.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1156856 + ... + 1606743.

It is an arithmetic number, because the mean of its divisors is an integer number (31921238160).

Almost surely, 2^621655013456 is an apocalyptic number.

It is an amenable number.

621655013456 is an abundant number, since it is smaller than the sum of its proper divisors (655194512944).

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

621655013456 is a wasteful number, since it uses less digits than its factorization.

621655013456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2764451 (or 2764445 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 621655013456 in words is "six hundred twenty-one billion, six hundred fifty-five million, thirteen thousand, four hundred fifty-six".