2645256132665 has 4 divisors (see below), whose sum is σ = 3174307359204. Its totient is φ = 2116204906128.

The previous prime is 2645256132647. The next prime is 2645256132703. The reversal of 2645256132665 is 5662316525462.

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 808718906944 + 1836537225721 = 899288^2 + 1355189^2 .

It is a cyclic number.

It is not a de Polignac number, because 2645256132665 - 2¹⁰ = 2645256131641 is a prime.

It is a Duffinian 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, 264525613262 + ... + 264525613271.

It is an arithmetic number, because the mean of its divisors is an integer number (793576839801).

Almost surely, 2^{2645256132665} is an apocalyptic number.

It is an amenable number.

2645256132665 is a deficient number, since it is larger than the sum of its proper divisors (529051226539).

2645256132665 is an equidigital number, since it uses as much as digits as its factorization.

2645256132665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529051226538.

The product of its digits is 15552000, while the sum is 53.

The spelling of 2645256132665 in words is "two trillion, six hundred forty-five billion, two hundred fifty-six million, one hundred thirty-two thousand, six hundred sixty-five".