18722088851 has 8 divisors (see below), whose sum is σ = 18937926144. Its totient is φ = 18507008520.

The previous prime is 18722088841. The next prime is 18722088857. The reversal of 18722088851 is 15888022781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18722088851 is a prime.

It is a super-2 number, since 2×18722088851² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18722088851.

It is not an unprimeable number, because it can be changed into a prime (18722088857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139415 + ... + 238496.

It is an arithmetic number, because the mean of its divisors is an integer number (2367240768).

Almost surely, 2^18722088851 is an apocalyptic number.

18722088851 is a deficient number, since it is larger than the sum of its proper divisors (215837293).

18722088851 is a wasteful number, since it uses less digits than its factorization.

18722088851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378481.

The product of its (nonzero) digits is 573440, while the sum is 50.

The spelling of 18722088851 in words is "eighteen billion, seven hundred twenty-two million, eighty-eight thousand, eight hundred fifty-one".