640173663342 has 24 divisors (see below), whose sum is σ = 1387167982200. Its totient is φ = 213371983440.

The previous prime is 640173663289. The next prime is 640173663377. The reversal of 640173663342 is 243366371046.

640173663342 is a `hidden beast` number, since 6 + 4 + 0 + 1 + 7 + 3 + 6 + 633 + 4 + 2 = 666.

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 11 ways as a sum of consecutive naturals, for example, 1397217 + ... + 1797932.

It is an arithmetic number, because the mean of its divisors is an integer number (57798665925).

Almost surely, 2^640173663342 is an apocalyptic number.

640173663342 is an abundant number, since it is smaller than the sum of its proper divisors (746994318858).

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

640173663342 is a wasteful number, since it uses less digits than its factorization.

640173663342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206288 (or 3206285 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 45.

The spelling of 640173663342 in words is "six hundred forty billion, one hundred seventy-three million, six hundred sixty-three thousand, three hundred forty-two".