18926798157 has 12 divisors (see below), whose sum is σ = 27580645404. Its totient is φ = 12506202240.

The previous prime is 18926798123. The next prime is 18926798167. The reversal of 18926798157 is 75189762981.

It can be written as a sum of positive squares in 2 ways, for example, as 2427138756 + 16499659401 = 49266^2 + 128451^2 .

It is not a de Polignac number, because 18926798157 - 2²² = 18922603853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18926798094 and 18926798103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18926798167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9304194 + ... + 9306227.

It is an arithmetic number, because the mean of its divisors is an integer number (2298387117).

Almost surely, 2^18926798157 is an apocalyptic number.

It is an amenable number.

18926798157 is a deficient number, since it is larger than the sum of its proper divisors (8653847247).

18926798157 is a wasteful number, since it uses less digits than its factorization.

18926798157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18610540 (or 18610537 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 63.

The spelling of 18926798157 in words is "eighteen billion, nine hundred twenty-six million, seven hundred ninety-eight thousand, one hundred fifty-seven".