16368658639 has 4 divisors (see below), whose sum is σ = 16368974856. Its totient is φ = 16368342424.

The previous prime is 16368658633. The next prime is 16368658643. The reversal of 16368658639 is 93685686361.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16368658639 - 2³³ = 7778724047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16368658633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60289 + ... + 190714.

It is an arithmetic number, because the mean of its divisors is an integer number (4092243714).

Almost surely, 2^16368658639 is an apocalyptic number.

16368658639 is a deficient number, since it is larger than the sum of its proper divisors (316217).

16368658639 is an equidigital number, since it uses as much as digits as its factorization.

16368658639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316216.

The product of its digits is 33592320, while the sum is 61.

The spelling of 16368658639 in words is "sixteen billion, three hundred sixty-eight million, six hundred fifty-eight thousand, six hundred thirty-nine".