1664124419 has 2 divisors, whose sum is σ = 1664124420. Its totient is φ = 1664124418.

The previous prime is 1664124401. The next prime is 1664124421. The reversal of 1664124419 is 9144214661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1664124419 - 2¹² = 1664120323 is a prime.

It is a super-2 number, since 2×1664124419² = 5538620163824175122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1664124421, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1664124499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832062209 + 832062210.

It is an arithmetic number, because the mean of its divisors is an integer number (832062210).

Almost surely, 2^1664124419 is an apocalyptic number.

1664124419 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664124419 is an equidigital number, since it uses as much as digits as its factorization.

1664124419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 38.

The square root of 1664124419 is about 40793.6811160748. The cubic root of 1664124419 is about 1185.0279611460.

The spelling of 1664124419 in words is "one billion, six hundred sixty-four million, one hundred twenty-four thousand, four hundred nineteen".