640627538163 has 8 divisors (see below), whose sum is σ = 874034470848. Its totient is φ = 417152815464.

The previous prime is 640627538123. The next prime is 640627538179. The reversal of 640627538163 is 361835726046.

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

It is not a de Polignac number, because 640627538163 - 2⁶ = 640627538099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640627538123) 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, 2483052345 + ... + 2483052602.

It is an arithmetic number, because the mean of its divisors is an integer number (109254308856).

Almost surely, 2^640627538163 is an apocalyptic number.

640627538163 is a deficient number, since it is larger than the sum of its proper divisors (233406932685).

640627538163 is a wasteful number, since it uses less digits than its factorization.

640627538163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966104993.

The product of its (nonzero) digits is 4354560, while the sum is 51.

The spelling of 640627538163 in words is "six hundred forty billion, six hundred twenty-seven million, five hundred thirty-eight thousand, one hundred sixty-three".