19659910851 has 12 divisors (see below), whose sum is σ = 32454456112. Its totient is φ = 11234234736.

The previous prime is 19659910843. The next prime is 19659910903. The reversal of 19659910851 is 15801995691.

It is not a de Polignac number, because 19659910851 - 2³ = 19659910843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19659910351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156030976 + ... + 156031101.

Almost surely, 2^19659910851 is an apocalyptic number.

19659910851 is a deficient number, since it is larger than the sum of its proper divisors (12794545261).

19659910851 is a wasteful number, since it uses less digits than its factorization.

19659910851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312062090 (or 312062087 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 54.

The spelling of 19659910851 in words is "nineteen billion, six hundred fifty-nine million, nine hundred ten thousand, eight hundred fifty-one".