640162919163 has 18 divisors (see below), whose sum is σ = 856106237532. Its totient is φ = 425501251680.

The previous prime is 640162919147. The next prime is 640162919173. The reversal of 640162919163 is 361919261046.

It is a happy number.

It is not a de Polignac number, because 640162919163 - 2⁴ = 640162919147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640162919173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 791301103 + ... + 791301911.

Almost surely, 2^640162919163 is an apocalyptic number.

640162919163 is a deficient number, since it is larger than the sum of its proper divisors (215943318369).

640162919163 is an frugal number, since it uses more digits than its factorization.

640162919163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763 (or 1383 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 48.

Multiplying 640162919163 by its sum of digits (48), we get a square (30727820119824 = 5543268²).

The spelling of 640162919163 in words is "six hundred forty billion, one hundred sixty-two million, nine hundred nineteen thousand, one hundred sixty-three".