640386577165 has 8 divisors (see below), whose sum is σ = 768468360960. Its totient is φ = 512306282832.

The previous prime is 640386577153. The next prime is 640386577211. The reversal of 640386577165 is 561775683046.

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 640386577165 - 2⁵ = 640386577133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1109992 + ... + 1585198.

It is an arithmetic number, because the mean of its divisors is an integer number (96058545120).

Almost surely, 2^640386577165 is an apocalyptic number.

It is an amenable number.

640386577165 is a deficient number, since it is larger than the sum of its proper divisors (128081783795).

640386577165 is a wasteful number, since it uses less digits than its factorization.

640386577165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744731.

The product of its (nonzero) digits is 25401600, while the sum is 58.

The spelling of 640386577165 in words is "six hundred forty billion, three hundred eighty-six million, five hundred seventy-seven thousand, one hundred sixty-five".