2005606639 has 2 divisors, whose sum is σ = 2005606640. Its totient is φ = 2005606638.

The previous prime is 2005606583. The next prime is 2005606661. The reversal of 2005606639 is 9366065002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2005606639 - 2²⁹ = 1468735727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2005606598 and 2005606607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2005606699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002803319 + 1002803320.

It is an arithmetic number, because the mean of its divisors is an integer number (1002803320).

Almost surely, 2^2005606639 is an apocalyptic number.

2005606639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005606639 is an equidigital number, since it uses as much as digits as its factorization.

2005606639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 2005606639 is about 44783.9998102001. Note that the first 3 decimals coincide. The cubic root of 2005606639 is about 1261.0972718858.

The spelling of 2005606639 in words is "two billion, five million, six hundred six thousand, six hundred thirty-nine".