621393670564 has 6 divisors (see below), whose sum is σ = 1087438923494. Its totient is φ = 310696835280.

The previous prime is 621393670537. The next prime is 621393670571. The reversal of 621393670564 is 465076393126.

It is a happy number.

621393670564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 616865726464 + 4527944100 = 785408^2 + 67290^2 .

It is a super-2 number, since 2×621393670564² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77674208817 + ... + 77674208824.

Almost surely, 2^621393670564 is an apocalyptic number.

It is an amenable number.

621393670564 is a deficient number, since it is larger than the sum of its proper divisors (466045252930).

621393670564 is a wasteful number, since it uses less digits than its factorization.

621393670564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155348417645 (or 155348417643 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 52.

The spelling of 621393670564 in words is "six hundred twenty-one billion, three hundred ninety-three million, six hundred seventy thousand, five hundred sixty-four".