621944397216 has 36 divisors (see below), whose sum is σ = 1768654380402. Its totient is φ = 207314798976.

The previous prime is 621944397203. The next prime is 621944397223. The reversal of 621944397216 is 612793449126.

621944397216 is a `hidden beast` number, since 6 + 2 + 194 + 439 + 7 + 2 + 16 = 666.

It can be written as a sum of positive squares in only one way, i.e., 557023395600 + 64921001616 = 746340^2 + 254796^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1079764291 + ... + 1079764866.

Almost surely, 2^621944397216 is an apocalyptic number.

It is an amenable number.

621944397216 is an abundant number, since it is smaller than the sum of its proper divisors (1146709983186).

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

621944397216 is a wasteful number, since it uses less digits than its factorization.

621944397216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159529173 (or 2159529162 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 621944397216 in words is "six hundred twenty-one billion, nine hundred forty-four million, three hundred ninety-seven thousand, two hundred sixteen".