2005645919 has 2 divisors, whose sum is σ = 2005645920. Its totient is φ = 2005645918.

The previous prime is 2005645897. The next prime is 2005645921. The reversal of 2005645919 is 9195465002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2005645919 - 2¹² = 2005641823 is a prime.

It is a super-2 number, since 2×2005645919² = 8045231104802709122, which contains 22 as substring.

Together with 2005645921, 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 (2005645949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002822959 + 1002822960.

It is an arithmetic number, because the mean of its divisors is an integer number (1002822960).

Almost surely, 2^2005645919 is an apocalyptic number.

2005645919 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005645919 is an equidigital number, since it uses as much as digits as its factorization.

2005645919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 2005645919 is about 44784.4383575367. The cubic root of 2005645919 is about 1261.1055047361.

The spelling of 2005645919 in words is "two billion, five million, six hundred forty-five thousand, nine hundred nineteen".