26691226687 has 4 divisors (see below), whose sum is σ = 26748381816. Its totient is φ = 26634071560.

The previous prime is 26691226621. The next prime is 26691226699. The reversal of 26691226687 is 78662219662.

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 26691226687 - 2²³ = 26682838079 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 (26691227687) 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, 28576864 + ... + 28577797.

It is an arithmetic number, because the mean of its divisors is an integer number (6687095454).

Almost surely, 2^26691226687 is an apocalyptic number.

26691226687 is a deficient number, since it is larger than the sum of its proper divisors (57155129).

26691226687 is an equidigital number, since it uses as much as digits as its factorization.

26691226687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57155128.

The product of its digits is 5225472, while the sum is 55.

The spelling of 26691226687 in words is "twenty-six billion, six hundred ninety-one million, two hundred twenty-six thousand, six hundred eighty-seven".