19809194692 has 12 divisors (see below), whose sum is σ = 39618389440. Its totient is φ = 8489654856.

The previous prime is 19809194687. The next prime is 19809194693. The reversal of 19809194692 is 29649190891.

It is a happy number.

19809194692 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (19809194693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353735592 + ... + 353735647.

Almost surely, 2^19809194692 is an apocalyptic number.

It is an amenable number.

19809194692 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19809194692 is a wasteful number, since it uses less digits than its factorization.

19809194692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707471250 (or 707471248 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 58.

The spelling of 19809194692 in words is "nineteen billion, eight hundred nine million, one hundred ninety-four thousand, six hundred ninety-two".