66464409 has 16 divisors (see below), whose sum is σ = 96885504. Its totient is φ = 40194000.

The previous prime is 66464401. The next prime is 66464417. The reversal of 66464409 is 90446466.

It is an interprime number because it is at equal distance from previous prime (66464401) and next prime (66464417).

It is not a de Polignac number, because 66464409 - 2³ = 66464401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66464401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15334 + ... + 19184.

It is an arithmetic number, because the mean of its divisors is an integer number (6055344).

Almost surely, 2^66464409 is an apocalyptic number.

It is an amenable number.

66464409 is a deficient number, since it is larger than the sum of its proper divisors (30421095).

66464409 is a wasteful number, since it uses less digits than its factorization.

66464409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388.

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 66464409 is about 8152.5706988655. The cubic root of 66464409 is about 405.0696603237.

The spelling of 66464409 in words is "sixty-six million, four hundred sixty-four thousand, four hundred nine".