19819157792 has 72 divisors (see below), whose sum is σ = 47778398640. Its totient is φ = 8046864000.

The previous prime is 19819157777. The next prime is 19819157797. The reversal of 19819157792 is 29775191891.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19819157797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 302834 + ... + 362417.

It is an arithmetic number, because the mean of its divisors is an integer number (663588870).

Almost surely, 2^19819157792 is an apocalyptic number.

It is an amenable number.

19819157792 is an abundant number, since it is smaller than the sum of its proper divisors (27959240848).

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

19819157792 is a wasteful number, since it uses less digits than its factorization.

19819157792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665294 (or 665279 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 59.

The spelling of 19819157792 in words is "nineteen billion, eight hundred nineteen million, one hundred fifty-seven thousand, seven hundred ninety-two".