26685617157 has 8 divisors (see below), whose sum is σ = 39534247680. Its totient is φ = 17790411420.

The previous prime is 26685617117. The next prime is 26685617159. The reversal of 26685617157 is 75171658662.

It is a happy number.

26685617157 is a `hidden beast` number, since 2 + 6 + 6 + 8 + 5 + 617 + 15 + 7 = 666.

It is not a de Polignac number, because 26685617157 - 2⁷ = 26685617029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26685617159) 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, 494178069 + ... + 494178122.

It is an arithmetic number, because the mean of its divisors is an integer number (4941780960).

Almost surely, 2^26685617157 is an apocalyptic number.

26685617157 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

26685617157 is a deficient number, since it is larger than the sum of its proper divisors (12848630523).

26685617157 is an equidigital number, since it uses as much as digits as its factorization.

26685617157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988356200 (or 988356194 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 54.

The spelling of 26685617157 in words is "twenty-six billion, six hundred eighty-five million, six hundred seventeen thousand, one hundred fifty-seven".