18395839877 has 2 divisors, whose sum is σ = 18395839878. Its totient is φ = 18395839876.

The previous prime is 18395839873. The next prime is 18395839883. The reversal of 18395839877 is 77893859381.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15742971841 + 2652868036 = 125471^2 + 51506^2 .

It is a cyclic number.

It is not a de Polignac number, because 18395839877 - 2² = 18395839873 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18395839873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9197919938 + 9197919939.

It is an arithmetic number, because the mean of its divisors is an integer number (9197919939).

Almost surely, 2^18395839877 is an apocalyptic number.

It is an amenable number.

18395839877 is a deficient number, since it is larger than the sum of its proper divisors (1).

18395839877 is an equidigital number, since it uses as much as digits as its factorization.

18395839877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 68.

The spelling of 18395839877 in words is "eighteen billion, three hundred ninety-five million, eight hundred thirty-nine thousand, eight hundred seventy-seven".