162543791638 has 32 divisors (see below), whose sum is σ = 261701556480. Its totient is φ = 75490380000.

The previous prime is 162543791623. The next prime is 162543791639. The reversal of 162543791638 is 836197345261.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162543791639) 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, 321913 + ... + 654763.

It is an arithmetic number, because the mean of its divisors is an integer number (8178173640).

Almost surely, 2^162543791638 is an apocalyptic number.

162543791638 is a deficient number, since it is larger than the sum of its proper divisors (99157764842).

162543791638 is a wasteful number, since it uses less digits than its factorization.

162543791638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333124.

The product of its digits is 6531840, while the sum is 55.

The spelling of 162543791638 in words is "one hundred sixty-two billion, five hundred forty-three million, seven hundred ninety-one thousand, six hundred thirty-eight".