26640245565 has 12 divisors (see below), whose sum is σ = 46176425724. Its totient is φ = 14208130944.

The previous prime is 26640245563. The next prime is 26640245603. The reversal of 26640245565 is 56554204662.

26640245565 is a `hidden beast` number, since 2 + 6 + 6 + 40 + 2 + 45 + 565 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19544878809 + 7095366756 = 139803^2 + 84234^2 .

It is not a de Polignac number, because 26640245565 - 2¹ = 26640245563 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 592005457 = 26640245565 / (2 + 6 + 6 + 4 + 0 + 2 + 4 + 5 + 5 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 26640245565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26640245563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 296002684 + ... + 296002773.

It is an arithmetic number, because the mean of its divisors is an integer number (3848035477).

Almost surely, 2^26640245565 is an apocalyptic number.

It is an amenable number.

26640245565 is a deficient number, since it is larger than the sum of its proper divisors (19536180159).

26640245565 is a wasteful number, since it uses less digits than its factorization.

26640245565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592005468 (or 592005465 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

The spelling of 26640245565 in words is "twenty-six billion, six hundred forty million, two hundred forty-five thousand, five hundred sixty-five".