640322651166 has 32 divisors (see below), whose sum is σ = 1397102169600. Its totient is φ = 194032366080.

The previous prime is 640322651161. The next prime is 640322651251. The reversal of 640322651166 is 661156223046.

It is a Curzon 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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3300670 + ... + 3489278.

It is an arithmetic number, because the mean of its divisors is an integer number (43659442800).

Almost surely, 2^640322651166 is an apocalyptic number.

640322651166 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

640322651166 is an abundant number, since it is smaller than the sum of its proper divisors (756779518434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640322651166 is a wasteful number, since it uses less digits than its factorization.

640322651166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240064.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 640322651166 in words is "six hundred forty billion, three hundred twenty-two million, six hundred fifty-one thousand, one hundred sixty-six".