66610663 has 16 divisors (see below), whose sum is σ = 78031360. Its totient is φ = 55683936.

The previous prime is 66610657. The next prime is 66610679. The reversal of 66610663 is 36601666.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-66610663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66610613) 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 15 ways as a sum of consecutive naturals, for example, 50470 + ... + 51772.

It is an arithmetic number, because the mean of its divisors is an integer number (4876960).

Almost surely, 2^66610663 is an apocalyptic number.

66610663 is a deficient number, since it is larger than the sum of its proper divisors (11420697).

66610663 is a wasteful number, since it uses less digits than its factorization.

66610663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 66610663 is about 8161.5355785538. The cubic root of 66610663 is about 405.3665593585.

The spelling of 66610663 in words is "sixty-six million, six hundred ten thousand, six hundred sixty-three".