664018519 has 2 divisors, whose sum is σ = 664018520. Its totient is φ = 664018518.

The previous prime is 664018507. The next prime is 664018549. The reversal of 664018519 is 915810466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664018519 - 2⁹ = 664018007 is a prime.

It is a super-2 number, since 2×664018519² = 881841187149906722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664018549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332009259 + 332009260.

It is an arithmetic number, because the mean of its divisors is an integer number (332009260).

Almost surely, 2^664018519 is an apocalyptic number.

664018519 is a deficient number, since it is larger than the sum of its proper divisors (1).

664018519 is an equidigital number, since it uses as much as digits as its factorization.

664018519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 664018519 is about 25768.5567892344. The cubic root of 664018519 is about 872.4222447765.

The spelling of 664018519 in words is "six hundred sixty-four million, eighteen thousand, five hundred nineteen".