19857416856 has 48 divisors (see below), whose sum is σ = 50825005560. Its totient is φ = 6465191040.

The previous prime is 19857416849. The next prime is 19857416863. The reversal of 19857416856 is 65861475891.

It is an interprime number because it is at equal distance from previous prime (19857416849) and next prime (19857416863).

It is a self number, because there is not a number n which added to its sum of digits gives 19857416856.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179365 + ... + 268116.

Almost surely, 2^19857416856 is an apocalyptic number.

It is an amenable number.

19857416856 is an abundant number, since it is smaller than the sum of its proper divisors (30967588704).

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

19857416856 is a wasteful number, since it uses less digits than its factorization.

19857416856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447576 (or 447529 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 60.

The spelling of 19857416856 in words is "nineteen billion, eight hundred fifty-seven million, four hundred sixteen thousand, eight hundred fifty-six".