2645312645 has 4 divisors (see below), whose sum is σ = 3174375180. Its totient is φ = 2116250112.

The previous prime is 2645312623. The next prime is 2645312687. The reversal of 2645312645 is 5462135462.

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 876100801 + 1769211844 = 29599^2 + 42062^2 .

It is a cyclic number.

It is not a de Polignac number, because 2645312645 - 2⁶ = 2645312581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2645312599 and 2645312608.

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, 264531260 + ... + 264531269.

It is an arithmetic number, because the mean of its divisors is an integer number (793593795).

Almost surely, 2^2645312645 is an apocalyptic number.

It is an amenable number.

2645312645 is a deficient number, since it is larger than the sum of its proper divisors (529062535).

2645312645 is an equidigital number, since it uses as much as digits as its factorization.

2645312645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529062534.

The product of its digits is 172800, while the sum is 38.

The square root of 2645312645 is about 51432.6029382142. The cubic root of 2645312645 is about 1383.0111113181.

The spelling of 2645312645 in words is "two billion, six hundred forty-five million, three hundred twelve thousand, six hundred forty-five".