639608995271 has 8 divisors (see below), whose sum is σ = 654511753104. Its totient is φ = 624707516160.

The previous prime is 639608995253. The next prime is 639608995279. The reversal of 639608995271 is 172599806936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 639608995271 - 2³⁴ = 622429126087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639608995198 and 639608995207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639608995279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732215 + ... + 1347351.

It is an arithmetic number, because the mean of its divisors is an integer number (81813969138).

Almost surely, 2^639608995271 is an apocalyptic number.

639608995271 is a deficient number, since it is larger than the sum of its proper divisors (14902757833).

639608995271 is a wasteful number, since it uses less digits than its factorization.

639608995271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639361.

The product of its (nonzero) digits is 44089920, while the sum is 65.

The spelling of 639608995271 in words is "six hundred thirty-nine billion, six hundred eight million, nine hundred ninety-five thousand, two hundred seventy-one".