64665199 has 2 divisors, whose sum is σ = 64665200. Its totient is φ = 64665198.

The previous prime is 64665187. The next prime is 64665203. The reversal of 64665199 is 99156646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64665199 - 2⁷ = 64665071 is a 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 (64665109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32332599 + 32332600.

It is an arithmetic number, because the mean of its divisors is an integer number (32332600).

Almost surely, 2^64665199 is an apocalyptic number.

64665199 is a deficient number, since it is larger than the sum of its proper divisors (1).

64665199 is an equidigital number, since it uses as much as digits as its factorization.

64665199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 46.

The square root of 64665199 is about 8041.4674655811. The cubic root of 64665199 is about 401.3810574630.

The spelling of 64665199 in words is "sixty-four million, six hundred sixty-five thousand, one hundred ninety-nine".