18956857353 has 32 divisors (see below), whose sum is σ = 29411942400. Its totient is φ = 10635949056.

The previous prime is 18956857331. The next prime is 18956857363. The reversal of 18956857353 is 35375865981.

It is not a de Polignac number, because 18956857353 - 2¹³ = 18956849161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18956857363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1060393 + ... + 1078121.

It is an arithmetic number, because the mean of its divisors is an integer number (919123200).

Almost surely, 2^18956857353 is an apocalyptic number.

It is an amenable number.

18956857353 is a deficient number, since it is larger than the sum of its proper divisors (10455085047).

18956857353 is a wasteful number, since it uses less digits than its factorization.

18956857353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18661.

The product of its digits is 27216000, while the sum is 60.

The spelling of 18956857353 in words is "eighteen billion, nine hundred fifty-six million, eight hundred fifty-seven thousand, three hundred fifty-three".