640322651167 has 4 divisors (see below), whose sum is σ = 641801456800. Its totient is φ = 638843845536.

The previous prime is 640322651161. The next prime is 640322651251. The reversal of 640322651167 is 761156223046.

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 640322651167 - 2³ = 640322651159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640322651161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 739402167 + ... + 739403032.

It is an arithmetic number, because the mean of its divisors is an integer number (160450364200).

Almost surely, 2^640322651167 is an apocalyptic number.

640322651167 is a deficient number, since it is larger than the sum of its proper divisors (1478805633).

640322651167 is a wasteful number, since it uses less digits than its factorization.

640322651167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478805632.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 640322651167 in words is "six hundred forty billion, three hundred twenty-two million, six hundred fifty-one thousand, one hundred sixty-seven".