26537890165 has 12 divisors (see below), whose sum is σ = 31887016524. Its totient is φ = 21202648896.

The previous prime is 26537890129. The next prime is 26537890189. The reversal of 26537890165 is 56109873562.

It can be written as a sum of positive squares in 2 ways, for example, as 4961511844 + 21576378321 = 70438^2 + 146889^2 .

It is a de Polignac number, because none of the positive numbers 2^k-26537890165 is a prime.

It is a super-2 number, since 2×26537890165² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3685809 + ... + 3693001.

It is an arithmetic number, because the mean of its divisors is an integer number (2657251377).

Almost surely, 2^26537890165 is an apocalyptic number.

It is an amenable number.

26537890165 is a deficient number, since it is larger than the sum of its proper divisors (5349126359).

26537890165 is an frugal number, since it uses more digits than its factorization.

26537890165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8916 (or 8057 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 26537890165 in words is "twenty-six billion, five hundred thirty-seven million, eight hundred ninety thousand, one hundred sixty-five".