2566612645 has 16 divisors (see below), whose sum is σ = 3121248240. Its totient is φ = 2025907200.

The previous prime is 2566612589. The next prime is 2566612673. The reversal of 2566612645 is 5462166652.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2405601 + 2564207044 = 1551^2 + 50638^2 .

It is not a de Polignac number, because 2566612645 - 2⁹ = 2566612133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121575 + ... + 141115.

It is an arithmetic number, because the mean of its divisors is an integer number (195078015).

Almost surely, 2^2566612645 is an apocalyptic number.

It is an amenable number.

2566612645 is a deficient number, since it is larger than the sum of its proper divisors (554635595).

2566612645 is a wasteful number, since it uses less digits than its factorization.

2566612645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19896.

The product of its digits is 518400, while the sum is 43.

The square root of 2566612645 is about 50661.7473543896. The cubic root of 2566612645 is about 1369.1576054530.

The spelling of 2566612645 in words is "two billion, five hundred sixty-six million, six hundred twelve thousand, six hundred forty-five".