640763387703 has 12 divisors (see below), whose sum is σ = 930897101160. Its totient is φ = 424706367696.

The previous prime is 640763387701. The next prime is 640763387707. The reversal of 640763387703 is 307783367046.

It is a happy number.

It is not a de Polignac number, because 640763387703 - 2¹ = 640763387701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640763387703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640763387701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205767033 + ... + 205770146.

It is an arithmetic number, because the mean of its divisors is an integer number (77574758430).

Almost surely, 2^640763387703 is an apocalyptic number.

640763387703 is a deficient number, since it is larger than the sum of its proper divisors (290133713457).

640763387703 is a wasteful number, since it uses less digits than its factorization.

640763387703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411537358 (or 411537355 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 54.

The spelling of 640763387703 in words is "six hundred forty billion, seven hundred sixty-three million, three hundred eighty-seven thousand, seven hundred three".