18040128857 has 2 divisors, whose sum is σ = 18040128858. Its totient is φ = 18040128856.

The previous prime is 18040128829. The next prime is 18040128941. The reversal of 18040128857 is 75882104081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18035415616 + 4713241 = 134296^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 18040128857 - 2⁶ = 18040128793 is a prime.

It is not a weakly prime, because it can be changed into another prime (18040128157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9020064428 + 9020064429.

It is an arithmetic number, because the mean of its divisors is an integer number (9020064429).

Almost surely, 2^18040128857 is an apocalyptic number.

It is an amenable number.

18040128857 is a deficient number, since it is larger than the sum of its proper divisors (1).

18040128857 is an equidigital number, since it uses as much as digits as its factorization.

18040128857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 143360, while the sum is 44.

The spelling of 18040128857 in words is "eighteen billion, forty million, one hundred twenty-eight thousand, eight hundred fifty-seven".