16385887117 has 2 divisors, whose sum is σ = 16385887118. Its totient is φ = 16385887116.

The previous prime is 16385887069. The next prime is 16385887123. The reversal of 16385887117 is 71178858361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16380416196 + 5470921 = 127986^2 + 2339^2 .

It is a cyclic number.

It is not a de Polignac number, because 16385887117 - 2²³ = 16377498509 is a prime.

It is a super-2 number, since 2×16385887117² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16385887127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8192943558 + 8192943559.

It is an arithmetic number, because the mean of its divisors is an integer number (8192943559).

Almost surely, 2^16385887117 is an apocalyptic number.

It is an amenable number.

16385887117 is a deficient number, since it is larger than the sum of its proper divisors (1).

16385887117 is an equidigital number, since it uses as much as digits as its factorization.

16385887117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 55.

The spelling of 16385887117 in words is "sixteen billion, three hundred eighty-five million, eight hundred eighty-seven thousand, one hundred seventeen".