2011565639 has 2 divisors, whose sum is σ = 2011565640. Its totient is φ = 2011565638.

The previous prime is 2011565581. The next prime is 2011565641. The reversal of 2011565639 is 9365651102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2011565639 - 2²⁴ = 1994788423 is a prime.

Together with 2011565641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011565659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005782819 + 1005782820.

It is an arithmetic number, because the mean of its divisors is an integer number (1005782820).

Almost surely, 2^2011565639 is an apocalyptic number.

2011565639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011565639 is an equidigital number, since it uses as much as digits as its factorization.

2011565639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 2011565639 is about 44850.4809227281. The cubic root of 2011565639 is about 1262.3450154355.

The spelling of 2011565639 in words is "two billion, eleven million, five hundred sixty-five thousand, six hundred thirty-nine".