640688207314 has 4 divisors (see below), whose sum is σ = 961032310974. Its totient is φ = 320344103656.

The previous prime is 640688207231. The next prime is 640688207323. The reversal of 640688207314 is 413702886046.

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

It can be written as a sum of positive squares in only one way, i.e., 590258768089 + 50429439225 = 768283^2 + 224565^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160172051827 + ... + 160172051830.

Almost surely, 2^640688207314 is an apocalyptic number.

640688207314 is a deficient number, since it is larger than the sum of its proper divisors (320344103660).

640688207314 is a wasteful number, since it uses less digits than its factorization.

640688207314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320344103659.

The product of its (nonzero) digits is 1548288, while the sum is 49.

The spelling of 640688207314 in words is "six hundred forty billion, six hundred eighty-eight million, two hundred seven thousand, three hundred fourteen".