18120492857 has 2 divisors, whose sum is σ = 18120492858. Its totient is φ = 18120492856.

The previous prime is 18120492779. The next prime is 18120492877. The reversal of 18120492857 is 75829402181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17440900096 + 679592761 = 132064^2 + 26069^2 .

It is a cyclic number.

It is not a de Polignac number, because 18120492857 - 2¹⁶ = 18120427321 is a prime.

It is a super-2 number, since 2×18120492857² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18120492877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9060246428 + 9060246429.

It is an arithmetic number, because the mean of its divisors is an integer number (9060246429).

Almost surely, 2^18120492857 is an apocalyptic number.

It is an amenable number.

18120492857 is a deficient number, since it is larger than the sum of its proper divisors (1).

18120492857 is an equidigital number, since it uses as much as digits as its factorization.

18120492857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 18120492857 in words is "eighteen billion, one hundred twenty million, four hundred ninety-two thousand, eight hundred fifty-seven".