16388156639 has 2 divisors, whose sum is σ = 16388156640. Its totient is φ = 16388156638.

The previous prime is 16388156633. The next prime is 16388156641. The reversal of 16388156639 is 93665188361.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (93665188361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16388156639 - 2⁴ = 16388156623 is a prime.

It is a super-3 number, since 3×16388156639³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 16388156641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16388156633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8194078319 + 8194078320.

It is an arithmetic number, because the mean of its divisors is an integer number (8194078320).

Almost surely, 2^16388156639 is an apocalyptic number.

16388156639 is a deficient number, since it is larger than the sum of its proper divisors (1).

16388156639 is an equidigital number, since it uses as much as digits as its factorization.

16388156639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 56.

The spelling of 16388156639 in words is "sixteen billion, three hundred eighty-eight million, one hundred fifty-six thousand, six hundred thirty-nine".