620555645634520 has 64 divisors (see below), whose sum is σ = 1396805622750720. Its totient is φ = 248123528002944.

The previous prime is 620555645634497. The next prime is 620555645634539. The reversal of 620555645634520 is 25436546555026.

It is a super-2 number, since 2×620555645634520² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1891387527 + ... + 1891715593.

It is an arithmetic number, because the mean of its divisors is an integer number (21825087855480).

Almost surely, 2^{620555645634520} is an apocalyptic number.

It is an amenable number.

620555645634520 is an abundant number, since it is smaller than the sum of its proper divisors (776249977116200).

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

620555645634520 is a wasteful number, since it uses less digits than its factorization.

620555645634520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346744 (or 346740 counting only the distinct ones).

The product of its (nonzero) digits is 129600000, while the sum is 58.

The spelling of 620555645634520 in words is "six hundred twenty trillion, five hundred fifty-five billion, six hundred forty-five million, six hundred thirty-four thousand, five hundred twenty".