19679847642 has 160 divisors (see below), whose sum is σ = 55020252672. Its totient is φ = 5118909696.

The previous prime is 19679847641. The next prime is 19679847647. The reversal of 19679847642 is 24674897691.

19679847642 is a `hidden beast` number, since 1 + 96 + 79 + 8 + 476 + 4 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 19679847642.

It is not an unprimeable number, because it can be changed into a prime (19679847641) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1067023 + ... + 1085309.

Almost surely, 2^19679847642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19679847642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27510126336).

19679847642 is an abundant number, since it is smaller than the sum of its proper divisors (35340405030).

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

19679847642 is a wasteful number, since it uses less digits than its factorization.

19679847642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18394 (or 18385 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 19679847642 in words is "nineteen billion, six hundred seventy-nine million, eight hundred forty-seven thousand, six hundred forty-two".