2639565893 has 2 divisors, whose sum is σ = 2639565894. Its totient is φ = 2639565892.

The previous prime is 2639565883. The next prime is 2639565941. The reversal of 2639565893 is 3985659362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2336562244 + 303003649 = 48338^2 + 17407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2639565893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2639565883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319782946 + 1319782947.

It is an arithmetic number, because the mean of its divisors is an integer number (1319782947).

Almost surely, 2^2639565893 is an apocalyptic number.

It is an amenable number.

2639565893 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639565893 is an equidigital number, since it uses as much as digits as its factorization.

2639565893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10497600, while the sum is 56.

The square root of 2639565893 is about 51376.7057429727. The cubic root of 2639565893 is about 1382.0088877310.

The spelling of 2639565893 in words is "two billion, six hundred thirty-nine million, five hundred sixty-five thousand, eight hundred ninety-three".