664161983 has 2 divisors, whose sum is σ = 664161984. Its totient is φ = 664161982.

The previous prime is 664161977. The next prime is 664162021. The reversal of 664161983 is 389161466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664161983 is a prime.

It is a super-2 number, since 2×664161983² = 882222279324984578, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664161913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332080991 + 332080992.

It is an arithmetic number, because the mean of its divisors is an integer number (332080992).

Almost surely, 2^664161983 is an apocalyptic number.

664161983 is a deficient number, since it is larger than the sum of its proper divisors (1).

664161983 is an equidigital number, since it uses as much as digits as its factorization.

664161983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 664161983 is about 25771.3403415500. The cubic root of 664161983 is about 872.4850704199.

The spelling of 664161983 in words is "six hundred sixty-four million, one hundred sixty-one thousand, nine hundred eighty-three".