621653944596 has 12 divisors (see below), whose sum is σ = 1450525870752. Its totient is φ = 207217981528.

The previous prime is 621653944591. The next prime is 621653944619. The reversal of 621653944596 is 695449356126.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621653944591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25902247680 + ... + 25902247703.

It is an arithmetic number, because the mean of its divisors is an integer number (120877155896).

Almost surely, 2^621653944596 is an apocalyptic number.

It is an amenable number.

621653944596 is an abundant number, since it is smaller than the sum of its proper divisors (828871926156).

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

621653944596 is a wasteful number, since it uses less digits than its factorization.

621653944596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51804495390 (or 51804495388 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 60.

The spelling of 621653944596 in words is "six hundred twenty-one billion, six hundred fifty-three million, nine hundred forty-four thousand, five hundred ninety-six".