640348188134 has 8 divisors (see below), whose sum is σ = 960592470240. Its totient is φ = 320150698056.

The previous prime is 640348188127. The next prime is 640348188157. The reversal of 640348188134 is 431881843046.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11663774 + ... + 11718545.

It is an arithmetic number, because the mean of its divisors is an integer number (120074058780).

Almost surely, 2^640348188134 is an apocalyptic number.

640348188134 is a deficient number, since it is larger than the sum of its proper divisors (320244282106).

640348188134 is a wasteful number, since it uses less digits than its factorization.

640348188134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23396014.

The product of its (nonzero) digits is 1769472, while the sum is 50.

The spelling of 640348188134 in words is "six hundred forty billion, three hundred forty-eight million, one hundred eighty-eight thousand, one hundred thirty-four".