2563939645 has 4 divisors (see below), whose sum is σ = 3076727580. Its totient is φ = 2051151712.

The previous prime is 2563939621. The next prime is 2563939657. The reversal of 2563939645 is 5469393652.

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 1528966404 + 1034973241 = 39102^2 + 32171^2 .

It is a cyclic number.

It is not a de Polignac number, because 2563939645 - 2⁵ = 2563939613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2563939592 and 2563939601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256393960 + ... + 256393969.

It is an arithmetic number, because the mean of its divisors is an integer number (769181895).

Almost surely, 2^2563939645 is an apocalyptic number.

It is an amenable number.

2563939645 is a deficient number, since it is larger than the sum of its proper divisors (512787935).

2563939645 is an equidigital number, since it uses as much as digits as its factorization.

2563939645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512787934.

The product of its digits is 5248800, while the sum is 52.

The square root of 2563939645 is about 50635.3596313880. The cubic root of 2563939645 is about 1368.6821370689.

The spelling of 2563939645 in words is "two billion, five hundred sixty-three million, nine hundred thirty-nine thousand, six hundred forty-five".