18077731807 has 2 divisors, whose sum is σ = 18077731808. Its totient is φ = 18077731806.

The previous prime is 18077731783. The next prime is 18077731829. The reversal of 18077731807 is 70813777081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18077731807 - 2¹⁵ = 18077699039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18077731897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9038865903 + 9038865904.

It is an arithmetic number, because the mean of its divisors is an integer number (9038865904).

Almost surely, 2^18077731807 is an apocalyptic number.

18077731807 is a deficient number, since it is larger than the sum of its proper divisors (1).

18077731807 is an equidigital number, since it uses as much as digits as its factorization.

18077731807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460992, while the sum is 49.

The spelling of 18077731807 in words is "eighteen billion, seventy-seven million, seven hundred thirty-one thousand, eight hundred seven".