816619754754642 has 64 divisors (see below), whose sum is σ = 1649331700383744. Its totient is φ = 269537157429120.

The previous prime is 816619754754637. The next prime is 816619754754667. The reversal of 816619754754642 is 246457457916618.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2057363923 + ... + 2057760809.

It is an arithmetic number, because the mean of its divisors is an integer number (25770807818496).

Almost surely, 2^{816619754754642} is an apocalyptic number.

816619754754642 is an abundant number, since it is smaller than the sum of its proper divisors (832711945629102).

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

816619754754642 is a wasteful number, since it uses less digits than its factorization.

816619754754642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404823.

The product of its digits is 2438553600, while the sum is 75.

The spelling of 816619754754642 in words is "eight hundred sixteen trillion, six hundred nineteen billion, seven hundred fifty-four million, seven hundred fifty-four thousand, six hundred forty-two".