26705864825 has 18 divisors (see below), whose sum is σ = 35067653406. Its totient is φ = 20105408640.

The previous prime is 26705864767. The next prime is 26705864851. The reversal of 26705864825 is 52846850762.

It can be written as a sum of positive squares in 3 ways, for example, as 4021589056 + 22684275769 = 63416^2 + 150613^2 .

It is not a de Polignac number, because 26705864825 - 2⁶ = 26705864761 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3365012 + ... + 3372938.

It is an arithmetic number, because the mean of its divisors is an integer number (1948202967).

Almost surely, 2^26705864825 is an apocalyptic number.

26705864825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

26705864825 is a deficient number, since it is larger than the sum of its proper divisors (8361788581).

26705864825 is an frugal number, since it uses more digits than its factorization.

26705864825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15881 (or 7949 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 53.

The spelling of 26705864825 in words is "twenty-six billion, seven hundred five million, eight hundred sixty-four thousand, eight hundred twenty-five".