640975309377 has 32 divisors (see below), whose sum is σ = 935647614720. Its totient is φ = 387903409920.

The previous prime is 640975309367. The next prime is 640975309409. The reversal of 640975309377 is 773903579046.

It is a happy number.

It is not a de Polignac number, because 640975309377 - 2⁴ = 640975309361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640975309377.

It is not an unprimeable number, because it can be changed into a prime (640975309367) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 13462788 + ... + 13510314.

It is an arithmetic number, because the mean of its divisors is an integer number (29238987960).

Almost surely, 2^640975309377 is an apocalyptic number.

It is an amenable number.

640975309377 is a deficient number, since it is larger than the sum of its proper divisors (294672305343).

640975309377 is a wasteful number, since it uses less digits than its factorization.

640975309377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53273.

The product of its (nonzero) digits is 30005640, while the sum is 60.

The spelling of 640975309377 in words is "six hundred forty billion, nine hundred seventy-five million, three hundred nine thousand, three hundred seventy-seven".