640346362907 has 4 divisors (see below), whose sum is σ = 674048803080. Its totient is φ = 606643922736.

The previous prime is 640346362879. The next prime is 640346362913. The reversal of 640346362907 is 709263643046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640346362907 - 2³⁰ = 639272621083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640346362987) 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 3 ways as a sum of consecutive naturals, for example, 16851220058 + ... + 16851220095.

It is an arithmetic number, because the mean of its divisors is an integer number (168512200770).

Almost surely, 2^640346362907 is an apocalyptic number.

640346362907 is a deficient number, since it is larger than the sum of its proper divisors (33702440173).

640346362907 is a wasteful number, since it uses less digits than its factorization.

640346362907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33702440172.

The product of its (nonzero) digits is 3919104, while the sum is 50.

The spelling of 640346362907 in words is "six hundred forty billion, three hundred forty-six million, three hundred sixty-two thousand, nine hundred seven".