2645344251 has 20 divisors (see below), whose sum is σ = 4310932824. Its totient is φ = 1603238400.

The previous prime is 2645344187. The next prime is 2645344253. The reversal of 2645344251 is 1524435462.

2645344251 is a `hidden beast` number, since 2 + 64 + 5 + 344 + 251 = 666.

It is not a de Polignac number, because 2645344251 - 2⁶ = 2645344187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2645344253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1483590 + ... + 1485371.

Almost surely, 2^2645344251 is an apocalyptic number.

2645344251 is a deficient number, since it is larger than the sum of its proper divisors (1665588573).

2645344251 is a wasteful number, since it uses less digits than its factorization.

2645344251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2968984 (or 2968975 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 2645344251 is about 51432.9101937660. The cubic root of 2645344251 is about 1383.0166193344.

The spelling of 2645344251 in words is "two billion, six hundred forty-five million, three hundred forty-four thousand, two hundred fifty-one".