620555645618768 has 20 divisors (see below), whose sum is σ = 1202328343808340. Its totient is φ = 310277363345664.

The previous prime is 620555645618749. The next prime is 620555645618773. The reversal of 620555645618768 is 867816546555026.

It can be written as a sum of positive squares in 2 ways, for example, as 493643434375744 + 126912211243024 = 22218088^2 + 11265532^2 .

It is a junction number, because it is equal to n+sod(n) for n = 620555645618695 and 620555645618704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17439773 + ... + 39309756.

It is an arithmetic number, because the mean of its divisors is an integer number (60116417190417).

Almost surely, 2^{620555645618768} is an apocalyptic number.

It is an amenable number.

620555645618768 is a deficient number, since it is larger than the sum of its proper divisors (581772698189572).

620555645618768 is a wasteful number, since it uses less digits than its factorization.

620555645618768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57432974 (or 57432968 counting only the distinct ones).

The product of its (nonzero) digits is 2903040000, while the sum is 74.

The spelling of 620555645618768 in words is "six hundred twenty trillion, five hundred fifty-five billion, six hundred forty-five million, six hundred eighteen thousand, seven hundred sixty-eight".