640082072167 has 4 divisors (see below), whose sum is σ = 641694369976. Its totient is φ = 638469774360.

The previous prime is 640082072141. The next prime is 640082072173. The reversal of 640082072167 is 761270280046.

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 640082072167 - 2¹⁹ = 640081547879 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 (640082072177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806148309 + ... + 806149102.

It is an arithmetic number, because the mean of its divisors is an integer number (160423592494).

Almost surely, 2^640082072167 is an apocalyptic number.

640082072167 is a deficient number, since it is larger than the sum of its proper divisors (1612297809).

640082072167 is a wasteful number, since it uses less digits than its factorization.

640082072167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612297808.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 640082072167 in words is "six hundred forty billion, eighty-two million, seventy-two thousand, one hundred sixty-seven".