19910992892 has 24 divisors (see below), whose sum is σ = 42164456544. Its totient is φ = 8031324672.

The previous prime is 19910992847. The next prime is 19910992951. The reversal of 19910992892 is 29829901991.

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20914433 + ... + 20915384.

It is an arithmetic number, because the mean of its divisors is an integer number (1756852356).

Almost surely, 2^19910992892 is an apocalyptic number.

It is an amenable number.

19910992892 is an abundant number, since it is smaller than the sum of its proper divisors (22253463652).

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

19910992892 is a wasteful number, since it uses less digits than its factorization.

19910992892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41829845 (or 41829843 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 59.

It can be divided in two parts, 1991099 and 2892, that added together give a palindrome (1993991).

The spelling of 19910992892 in words is "nineteen billion, nine hundred ten million, nine hundred ninety-two thousand, eight hundred ninety-two".