26391578679 has 10 divisors (see below), whose sum is σ = 39424457160. Its totient is φ = 17594385732.

The previous prime is 26391578677. The next prime is 26391578693. The reversal of 26391578679 is 97687519362.

26391578679 is a `hidden beast` number, since 26 + 39 + 1 + 578 + 6 + 7 + 9 = 666.

It is not a de Polignac number, because 26391578679 - 2¹ = 26391578677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26391578671) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 162910899 + ... + 162911060.

It is an arithmetic number, because the mean of its divisors is an integer number (3942445716).

Almost surely, 2^26391578679 is an apocalyptic number.

26391578679 is a deficient number, since it is larger than the sum of its proper divisors (13032878481).

26391578679 is an equidigital number, since it uses as much as digits as its factorization.

26391578679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325821971 (or 325821962 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 63.

The spelling of 26391578679 in words is "twenty-six billion, three hundred ninety-one million, five hundred seventy-eight thousand, six hundred seventy-nine".