664050839 has 2 divisors, whose sum is σ = 664050840. Its totient is φ = 664050838.

The previous prime is 664050797. The next prime is 664050847. The reversal of 664050839 is 938050466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664050839 - 2¹² = 664046743 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 664050796 and 664050805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664050899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332025419 + 332025420.

It is an arithmetic number, because the mean of its divisors is an integer number (332025420).

Almost surely, 2^664050839 is an apocalyptic number.

664050839 is a deficient number, since it is larger than the sum of its proper divisors (1).

664050839 is an equidigital number, since it uses as much as digits as its factorization.

664050839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 664050839 is about 25769.1839024832. The cubic root of 664050839 is about 872.4363991154.

The spelling of 664050839 in words is "six hundred sixty-four million, fifty thousand, eight hundred thirty-nine".