639757946097 has 24 divisors (see below), whose sum is σ = 927736977024. Its totient is φ = 424824750144.

The previous prime is 639757946089. The next prime is 639757946129. The reversal of 639757946097 is 790649757936.

639757946097 is a `hidden beast` number, since 6 + 3 + 9 + 7 + 5 + 7 + 9 + 4 + 609 + 7 = 666.

639757946097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 639757946097 - 2³ = 639757946089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639757946197) 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, 23104653 + ... + 23132325.

It is an arithmetic number, because the mean of its divisors is an integer number (38655707376).

Almost surely, 2^639757946097 is an apocalyptic number.

It is an amenable number.

639757946097 is a deficient number, since it is larger than the sum of its proper divisors (287979030927).

639757946097 is a wasteful number, since it uses less digits than its factorization.

639757946097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37709 (or 37706 counting only the distinct ones).

The product of its (nonzero) digits is 540101520, while the sum is 72.

The spelling of 639757946097 in words is "six hundred thirty-nine billion, seven hundred fifty-seven million, nine hundred forty-six thousand, ninety-seven".