26791978615 has 8 divisors (see below), whose sum is σ = 32468695488. Its totient is φ = 21221368800.

The previous prime is 26791978579. The next prime is 26791978627. The reversal of 26791978615 is 51687919762.

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

It is not a de Polignac number, because 26791978615 - 2¹¹ = 26791976567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26526207 + ... + 26527216.

It is an arithmetic number, because the mean of its divisors is an integer number (4058586936).

Almost surely, 2^26791978615 is an apocalyptic number.

26791978615 is a deficient number, since it is larger than the sum of its proper divisors (5676716873).

26791978615 is a wasteful number, since it uses less digits than its factorization.

26791978615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53053529.

The product of its digits is 11430720, while the sum is 61.

The spelling of 26791978615 in words is "twenty-six billion, seven hundred ninety-one million, nine hundred seventy-eight thousand, six hundred fifteen".