2640599423309 has 2 divisors, whose sum is σ = 2640599423310. Its totient is φ = 2640599423308.

The previous prime is 2640599423269. The next prime is 2640599423339. The reversal of 2640599423309 is 9033249950462.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1765257676900 + 875341746409 = 1328630^2 + 935597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2640599423309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2640599423339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320299711654 + 1320299711655.

It is an arithmetic number, because the mean of its divisors is an integer number (1320299711655).

Almost surely, 2^{2640599423309} is an apocalyptic number.

It is an amenable number.

2640599423309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640599423309 is an equidigital number, since it uses as much as digits as its factorization.

2640599423309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12597120, while the sum is 56.

The spelling of 2640599423309 in words is "two trillion, six hundred forty billion, five hundred ninety-nine million, four hundred twenty-three thousand, three hundred nine".