639770625564 has 24 divisors (see below), whose sum is σ = 1706055001728. Its totient is φ = 182791607280.

The previous prime is 639770625517. The next prime is 639770625589. The reversal of 639770625564 is 465526077936.

It is a junction number, because it is equal to n+sod(n) for n = 639770625498 and 639770625507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3808158402 + ... + 3808158569.

It is an arithmetic number, because the mean of its divisors is an integer number (71085625072).

Almost surely, 2^639770625564 is an apocalyptic number.

It is an amenable number.

639770625564 is an abundant number, since it is smaller than the sum of its proper divisors (1066284376164).

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

639770625564 is a wasteful number, since it uses less digits than its factorization.

639770625564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7616316985 (or 7616316983 counting only the distinct ones).

The product of its (nonzero) digits is 57153600, while the sum is 60.

The spelling of 639770625564 in words is "six hundred thirty-nine billion, seven hundred seventy million, six hundred twenty-five thousand, five hundred sixty-four".