26466513257 has 8 divisors (see below), whose sum is σ = 28024795656. Its totient is φ = 24908389632.

The previous prime is 26466513247. The next prime is 26466513263. The reversal of 26466513257 is 75231566462.

It can be written as a sum of positive squares in 4 ways, for example, as 5725040896 + 20741472361 = 75664^2 + 144019^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26466513257 - 2⁸ = 26466513001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26466513247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580463 + ... + 624395.

It is an arithmetic number, because the mean of its divisors is an integer number (3503099457).

Almost surely, 2^26466513257 is an apocalyptic number.

It is an amenable number.

26466513257 is a deficient number, since it is larger than the sum of its proper divisors (1558282399).

26466513257 is a wasteful number, since it uses less digits than its factorization.

26466513257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79387.

The product of its digits is 1814400, while the sum is 47.

The spelling of 26466513257 in words is "twenty-six billion, four hundred sixty-six million, five hundred thirteen thousand, two hundred fifty-seven".