18385776313 has 2 divisors, whose sum is σ = 18385776314. Its totient is φ = 18385776312.

The previous prime is 18385776307. The next prime is 18385776361. The reversal of 18385776313 is 31367758381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11019330729 + 7366445584 = 104973^2 + 85828^2 .

It is a cyclic number.

It is not a de Polignac number, because 18385776313 - 2²¹ = 18383679161 is a prime.

It is not a weakly prime, because it can be changed into another prime (18385776713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9192888156 + 9192888157.

It is an arithmetic number, because the mean of its divisors is an integer number (9192888157).

Almost surely, 2^18385776313 is an apocalyptic number.

It is an amenable number.

18385776313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18385776313 is an equidigital number, since it uses as much as digits as its factorization.

18385776313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 52.

The spelling of 18385776313 in words is "eighteen billion, three hundred eighty-five million, seven hundred seventy-six thousand, three hundred thirteen".