2649645243 has 16 divisors (see below), whose sum is σ = 4486172160. Its totient is φ = 1514082888.

The previous prime is 2649645223. The next prime is 2649645253. The reversal of 2649645243 is 3425469462.

2649645243 is a `hidden beast` number, since 2 + 64 + 9 + 64 + 524 + 3 = 666.

It is not a de Polignac number, because 2649645243 - 2⁹ = 2649644731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2649645203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7009455 + ... + 7009832.

It is an arithmetic number, because the mean of its divisors is an integer number (280385760).

Almost surely, 2^2649645243 is an apocalyptic number.

2649645243 is a deficient number, since it is larger than the sum of its proper divisors (1836526917).

2649645243 is a wasteful number, since it uses less digits than its factorization.

2649645243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14019303 (or 14019297 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The square root of 2649645243 is about 51474.7048850210. The cubic root of 2649645243 is about 1383.7657496316.

The spelling of 2649645243 in words is "two billion, six hundred forty-nine million, six hundred forty-five thousand, two hundred forty-three".