639195936057 has 24 divisors (see below), whose sum is σ = 1058368484160. Its totient is φ = 364151319840.

The previous prime is 639195936037. The next prime is 639195936077. The reversal of 639195936057 is 750639591936.

639195936057 is a `hidden beast` number, since 6 + 3 + 9 + 19 + 5 + 9 + 3 + 605 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (639195936037) and next prime (639195936077).

It is not a de Polignac number, because 639195936057 - 2¹⁹ = 639195411769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 639195935985 and 639195936003.

It is not an unprimeable number, because it can be changed into a prime (639195936007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15305382 + ... + 15347087.

It is an arithmetic number, because the mean of its divisors is an integer number (44098686840).

Almost surely, 2^639195936057 is an apocalyptic number.

It is an amenable number.

639195936057 is a deficient number, since it is larger than the sum of its proper divisors (419172548103).

639195936057 is a wasteful number, since it uses less digits than its factorization.

639195936057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30652813 (or 30652810 counting only the distinct ones).

The product of its (nonzero) digits is 41334300, while the sum is 63.

The spelling of 639195936057 in words is "six hundred thirty-nine billion, one hundred ninety-five million, nine hundred thirty-six thousand, fifty-seven".