16391287639 has 8 divisors (see below), whose sum is σ = 16555788288. Its totient is φ = 16227340920.

The previous prime is 16391287637. The next prime is 16391287643. The reversal of 16391287639 is 93678219361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16391287639 - 2¹ = 16391287637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16391287639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16391287637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78877 + ... + 197494.

It is an arithmetic number, because the mean of its divisors is an integer number (2069473536).

Almost surely, 2^16391287639 is an apocalyptic number.

16391287639 is a deficient number, since it is larger than the sum of its proper divisors (164500649).

16391287639 is a wasteful number, since it uses less digits than its factorization.

16391287639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276965.

The product of its digits is 2939328, while the sum is 55.

The spelling of 16391287639 in words is "sixteen billion, three hundred ninety-one million, two hundred eighty-seven thousand, six hundred thirty-nine".