640442066462 has 16 divisors (see below), whose sum is σ = 1070293900032. Its totient is φ = 284916199320.

The previous prime is 640442066447. The next prime is 640442066503. The reversal of 640442066462 is 264660244046.

It is a congruent number.

It is an unprimeable number.

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, 309690488 + ... + 309692555.

It is an arithmetic number, because the mean of its divisors is an integer number (66893368752).

Almost surely, 2^640442066462 is an apocalyptic number.

640442066462 is a deficient number, since it is larger than the sum of its proper divisors (429851833570).

640442066462 is a wasteful number, since it uses less digits than its factorization.

640442066462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619383103.

The product of its (nonzero) digits is 1327104, while the sum is 44.

The spelling of 640442066462 in words is "six hundred forty billion, four hundred forty-two million, sixty-six thousand, four hundred sixty-two".