640434271675 has 48 divisors (see below), whose sum is σ = 876067570944. Its totient is φ = 460553040000.

The previous prime is 640434271619. The next prime is 640434271703. The reversal of 640434271675 is 576172434046.

It is not a de Polignac number, because 640434271675 - 2⁹ = 640434271163 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15898810 + ... + 15939040.

It is an arithmetic number, because the mean of its divisors is an integer number (18251407728).

Almost surely, 2^640434271675 is an apocalyptic number.

640434271675 is a deficient number, since it is larger than the sum of its proper divisors (235633299269).

640434271675 is a wasteful number, since it uses less digits than its factorization.

640434271675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40900 (or 40895 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 49.

The spelling of 640434271675 in words is "six hundred forty billion, four hundred thirty-four million, two hundred seventy-one thousand, six hundred seventy-five".