26664491565 has 96 divisors (see below), whose sum is σ = 48313774080. Its totient is φ = 13592880000.

The previous prime is 26664491533. The next prime is 26664491599. The reversal of 26664491565 is 56519446662.

It is not a de Polignac number, because 26664491565 - 2⁵ = 26664491533 is a prime.

It is a super-2 number, since 2×26664491565² (a number of 22 digits) contains 22 as substring.

It is a congruent 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 95 ways as a sum of consecutive naturals, for example, 35504940 + ... + 35505690.

It is an arithmetic number, because the mean of its divisors is an integer number (503268480).

Almost surely, 2^26664491565 is an apocalyptic number.

It is an amenable number.

26664491565 is a deficient number, since it is larger than the sum of its proper divisors (21649282515).

26664491565 is a wasteful number, since it uses less digits than its factorization.

26664491565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175 (or 1172 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 54.

The spelling of 26664491565 in words is "twenty-six billion, six hundred sixty-four million, four hundred ninety-one thousand, five hundred sixty-five".