26505624791 has 4 divisors (see below), whose sum is σ = 26824969752. Its totient is φ = 26186279832.

The previous prime is 26505624767. The next prime is 26505624793. The reversal of 26505624791 is 19742650562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26505624791 is a prime.

It is a super-2 number, since 2×26505624791² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26505624793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159672356 + ... + 159672521.

It is an arithmetic number, because the mean of its divisors is an integer number (6706242438).

Almost surely, 2^26505624791 is an apocalyptic number.

26505624791 is a deficient number, since it is larger than the sum of its proper divisors (319344961).

26505624791 is an equidigital number, since it uses as much as digits as its factorization.

26505624791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319344960.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 26505624791 in words is "twenty-six billion, five hundred five million, six hundred twenty-four thousand, seven hundred ninety-one".