26640253900165 has 4 divisors (see below), whose sum is σ = 31968304680204. Its totient is φ = 21312203120128.

The previous prime is 26640253900087. The next prime is 26640253900171. The reversal of 26640253900165 is 56100935204662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8525500663716 + 18114753236449 = 2919846^2 + 4256143^2 .

It is a cyclic number.

It is not a de Polignac number, because 26640253900165 - 2⁷ = 26640253900037 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 2664025390012 + ... + 2664025390021.

It is an arithmetic number, because the mean of its divisors is an integer number (7992076170051).

Almost surely, 2^{26640253900165} is an apocalyptic number.

It is an amenable number.

26640253900165 is a deficient number, since it is larger than the sum of its proper divisors (5328050780039).

26640253900165 is an equidigital number, since it uses as much as digits as its factorization.

26640253900165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328050780038.

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 26640253900165 in words is "twenty-six trillion, six hundred forty billion, two hundred fifty-three million, nine hundred thousand, one hundred sixty-five".