26708917616639 has 4 divisors (see below), whose sum is σ = 26714412153000. Its totient is φ = 26703423080280.

The previous prime is 26708917616587. The next prime is 26708917616783. The reversal of 26708917616639 is 93661671980762.

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 26708917616639 - 2¹⁶ = 26708917551103 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 (26708917616839) 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, 2747260889 + ... + 2747270610.

It is an arithmetic number, because the mean of its divisors is an integer number (6678603038250).

Almost surely, 2^{26708917616639} is an apocalyptic number.

26708917616639 is a deficient number, since it is larger than the sum of its proper divisors (5494536361).

26708917616639 is an equidigital number, since it uses as much as digits as its factorization.

26708917616639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5494536360.

The product of its (nonzero) digits is 246903552, while the sum is 71.

The spelling of 26708917616639 in words is "twenty-six trillion, seven hundred eight billion, nine hundred seventeen million, six hundred sixteen thousand, six hundred thirty-nine".