640631211514 has 16 divisors (see below), whose sum is σ = 1098300541248. Its totient is φ = 274537331712.

The previous prime is 640631211511. The next prime is 640631211527. The reversal of 640631211514 is 415112136046.

It is a self number, because there is not a number n which added to its sum of digits gives 640631211514.

It is not an unprimeable number, because it can be changed into a prime (640631211511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1363552 + ... + 1772155.

It is an arithmetic number, because the mean of its divisors is an integer number (68643783828).

Almost surely, 2^640631211514 is an apocalyptic number.

640631211514 is a deficient number, since it is larger than the sum of its proper divisors (457669329734).

640631211514 is a wasteful number, since it uses less digits than its factorization.

640631211514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3150309.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 640631211514 in words is "six hundred forty billion, six hundred thirty-one million, two hundred eleven thousand, five hundred fourteen".