621776540456 has 8 divisors (see below), whose sum is σ = 1165831013370. Its totient is φ = 310888270224.

The previous prime is 621776540443. The next prime is 621776540507. The reversal of 621776540456 is 654045677126.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 616328624356 + 5447916100 = 785066^2 + 73810^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×621776540456² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621776540398 and 621776540407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38861033771 + ... + 38861033786.

Almost surely, 2^621776540456 is an apocalyptic number.

It is an amenable number.

621776540456 is a deficient number, since it is larger than the sum of its proper divisors (544054472914).

621776540456 is a wasteful number, since it uses less digits than its factorization.

621776540456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77722067563 (or 77722067559 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 53.

The spelling of 621776540456 in words is "six hundred twenty-one billion, seven hundred seventy-six million, five hundred forty thousand, four hundred fifty-six".