621649360000 has 80 divisors (see below), whose sum is σ = 1547557427790. Its totient is φ = 248659712000.

The previous prime is 621649359979. The next prime is 621649360009. The reversal of 621649360000 is 63946126.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 63210005056 + 558439354944 = 251416^2 + 747288^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (621649360009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3805309 + ... + 3965308.

Almost surely, 2^621649360000 is an apocalyptic number.

It is an amenable number.

621649360000 is an abundant number, since it is smaller than the sum of its proper divisors (925908067790).

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

621649360000 is an frugal number, since it uses more digits than its factorization.

621649360000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770651 (or 7770624 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The spelling of 621649360000 in words is "six hundred twenty-one billion, six hundred forty-nine million, three hundred sixty thousand".