66904463 has 4 divisors (see below), whose sum is σ = 67291368. Its totient is φ = 66517560.

The previous prime is 66904459. The next prime is 66904471. The reversal of 66904463 is 36440966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66904463 - 2² = 66904459 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66904763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193193 + ... + 193538.

It is an arithmetic number, because the mean of its divisors is an integer number (16822842).

Almost surely, 2^66904463 is an apocalyptic number.

66904463 is a deficient number, since it is larger than the sum of its proper divisors (386905).

66904463 is a wasteful number, since it uses less digits than its factorization.

66904463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386904.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 66904463 is about 8179.5148389131. The cubic root of 66904463 is about 405.9616693977.

The spelling of 66904463 in words is "sixty-six million, nine hundred four thousand, four hundred sixty-three".