2645205679 has 2 divisors, whose sum is σ = 2645205680. Its totient is φ = 2645205678.

The previous prime is 2645205671. The next prime is 2645205691. The reversal of 2645205679 is 9765025462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2645205679 - 2³ = 2645205671 is a prime.

It is a super-2 number, since 2×2645205679² = 13994226168427702082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2645205671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322602839 + 1322602840.

It is an arithmetic number, because the mean of its divisors is an integer number (1322602840).

Almost surely, 2^2645205679 is an apocalyptic number.

2645205679 is a deficient number, since it is larger than the sum of its proper divisors (1).

2645205679 is an equidigital number, since it uses as much as digits as its factorization.

2645205679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 46.

The square root of 2645205679 is about 51431.5630619953. The cubic root of 2645205679 is about 1382.9924698970.

The spelling of 2645205679 in words is "two billion, six hundred forty-five million, two hundred five thousand, six hundred seventy-nine".