2640245213 has 2 divisors, whose sum is σ = 2640245214. Its totient is φ = 2640245212.

The previous prime is 2640245183. The next prime is 2640245227. The reversal of 2640245213 is 3125420462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1545826489 + 1094418724 = 39317^2 + 33082^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640245213 - 2¹⁶ = 2640179677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2640245243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320122606 + 1320122607.

It is an arithmetic number, because the mean of its divisors is an integer number (1320122607).

Almost surely, 2^2640245213 is an apocalyptic number.

It is an amenable number.

2640245213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640245213 is an equidigital number, since it uses as much as digits as its factorization.

2640245213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 2640245213 is about 51383.3164850226. The cubic root of 2640245213 is about 1382.1274357282.

Adding to 2640245213 its reverse (3125420462), we get a palindrome (5765665675).

The spelling of 2640245213 in words is "two billion, six hundred forty million, two hundred forty-five thousand, two hundred thirteen".