621904664322 has 126 divisors (see below), whose sum is σ = 1477492207443. Its totient is φ = 196210274184.

The previous prime is 621904664317. The next prime is 621904664347. The reversal of 621904664322 is 223466409126.

621904664322 is a `hidden beast` number, since 62 + 1 + 90 + 466 + 43 + 2 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 310952332161 + 310952332161 = 557631^2 + 557631^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=557631.

It is an unprimeable number.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 572128863 + ... + 572129949.

Almost surely, 2^621904664322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621904664322

621904664322 is an abundant number, since it is smaller than the sum of its proper divisors (855587543121).

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

621904664322 is an frugal number, since it uses more digits than its factorization.

621904664322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232 (or 1111 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The spelling of 621904664322 in words is "six hundred twenty-one billion, nine hundred four million, six hundred sixty-four thousand, three hundred twenty-two".