640162919173 has 2 divisors, whose sum is σ = 640162919174. Its totient is φ = 640162919172.

The previous prime is 640162919147. The next prime is 640162919197. The reversal of 640162919173 is 371919261046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518698122849 + 121464796324 = 720207^2 + 348518^2 .

It is a cyclic number.

It is not a de Polignac number, because 640162919173 - 2³⁷ = 502723965701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640162919273) by changing a digit.

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 as a sum of consecutive naturals, namely, 320081459586 + 320081459587.

It is an arithmetic number, because the mean of its divisors is an integer number (320081459587).

Almost surely, 2^640162919173 is an apocalyptic number.

It is an amenable number.

640162919173 is a deficient number, since it is larger than the sum of its proper divisors (1).

640162919173 is an equidigital number, since it uses as much as digits as its factorization.

640162919173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 640162919173 in words is "six hundred forty billion, one hundred sixty-two million, nine hundred nineteen thousand, one hundred seventy-three".