19518156858 has 32 divisors (see below), whose sum is σ = 41949486144. Its totient is φ = 6031948032.

The previous prime is 19518156829. The next prime is 19518156871. The reversal of 19518156858 is 85865181591.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 19518156798 and 19518156807.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1421185 + ... + 1434852.

It is an arithmetic number, because the mean of its divisors is an integer number (1310921442).

Almost surely, 2^19518156858 is an apocalyptic number.

19518156858 is an abundant number, since it is smaller than the sum of its proper divisors (22431329286).

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

19518156858 is a wasteful number, since it uses less digits than its factorization.

19518156858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856126.

The product of its digits is 3456000, while the sum is 57.

The spelling of 19518156858 in words is "nineteen billion, five hundred eighteen million, one hundred fifty-six thousand, eight hundred fifty-eight".