2645638591 has 2 divisors, whose sum is σ = 2645638592. Its totient is φ = 2645638590.

The previous prime is 2645638561. The next prime is 2645638607. The reversal of 2645638591 is 1958365462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2645638591 - 2⁵ = 2645638559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2645638531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322819295 + 1322819296.

It is an arithmetic number, because the mean of its divisors is an integer number (1322819296).

Almost surely, 2^2645638591 is an apocalyptic number.

2645638591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2645638591 is an equidigital number, since it uses as much as digits as its factorization.

2645638591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 49.

The square root of 2645638591 is about 51435.7715116630. The cubic root of 2645638591 is about 1383.0679122193.

The spelling of 2645638591 in words is "two billion, six hundred forty-five million, six hundred thirty-eight thousand, five hundred ninety-one".