26257866865 has 8 divisors (see below), whose sum is σ = 32595972840. Its totient is φ = 20281938432.

The previous prime is 26257866847. The next prime is 26257866871. The reversal of 26257866865 is 56866875262.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1472717376 + 24785149489 = 38376^2 + 157433^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26257866865 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90544224 + ... + 90544513.

It is an arithmetic number, because the mean of its divisors is an integer number (4074496605).

Almost surely, 2^26257866865 is an apocalyptic number.

It is an amenable number.

26257866865 is a deficient number, since it is larger than the sum of its proper divisors (6338105975).

26257866865 is a wasteful number, since it uses less digits than its factorization.

26257866865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181088771.

The product of its digits is 58060800, while the sum is 61.

The spelling of 26257866865 in words is "twenty-six billion, two hundred fifty-seven million, eight hundred sixty-six thousand, eight hundred sixty-five".