2565106945553 has 4 divisors (see below), whose sum is σ = 2565144564288. Its totient is φ = 2565069326820.

The previous prime is 2565106945537. The next prime is 2565106945607. The reversal of 2565106945553 is 3555496015652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2565106945553 - 2⁴ = 2565106945537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2565106945153) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 18706901 + ... + 18843522.

It is an arithmetic number, because the mean of its divisors is an integer number (641286141072).

Almost surely, 2^{2565106945553} is an apocalyptic number.

It is an amenable number.

2565106945553 is a deficient number, since it is larger than the sum of its proper divisors (37618735).

2565106945553 is an equidigital number, since it uses as much as digits as its factorization.

2565106945553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37618734.

The product of its (nonzero) digits is 24300000, while the sum is 56.

The spelling of 2565106945553 in words is "two trillion, five hundred sixty-five billion, one hundred six million, nine hundred forty-five thousand, five hundred fifty-three".