2563641265 has 4 divisors (see below), whose sum is σ = 3076369524. Its totient is φ = 2050913008.

The previous prime is 2563641257. The next prime is 2563641277. The reversal of 2563641265 is 5621463652.

It is a happy number.

2563641265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 845704561 + 1717936704 = 29081^2 + 41448^2 .

It is a cyclic number.

It is not a de Polignac number, because 2563641265 - 2³ = 2563641257 is a prime.

It is a super-2 number, since 2×2563641265² = 13144513071221600450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 256364122 + ... + 256364131.

It is an arithmetic number, because the mean of its divisors is an integer number (769092381).

Almost surely, 2^2563641265 is an apocalyptic number.

It is an amenable number.

2563641265 is a deficient number, since it is larger than the sum of its proper divisors (512728259).

2563641265 is an equidigital number, since it uses as much as digits as its factorization.

2563641265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512728258.

The product of its digits is 259200, while the sum is 40.

The square root of 2563641265 is about 50632.4131856265. The cubic root of 2563641265 is about 1368.6290412768.

The spelling of 2563641265 in words is "two billion, five hundred sixty-three million, six hundred forty-one thousand, two hundred sixty-five".