640250855767 has 8 divisors (see below), whose sum is σ = 673348386816. Its totient is φ = 607591702872.

The previous prime is 640250855639. The next prime is 640250855779. The reversal of 640250855767 is 767558052046.

It is a happy number.

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 640250855767 - 2⁷ = 640250855639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640250855467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109591543 + ... + 109597384.

It is an arithmetic number, because the mean of its divisors is an integer number (84168548352).

Almost surely, 2^640250855767 is an apocalyptic number.

640250855767 is a deficient number, since it is larger than the sum of its proper divisors (33097531049).

640250855767 is a wasteful number, since it uses less digits than its factorization.

640250855767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219189077.

The product of its (nonzero) digits is 14112000, while the sum is 55.

The spelling of 640250855767 in words is "six hundred forty billion, two hundred fifty million, eight hundred fifty-five thousand, seven hundred sixty-seven".