66607566 has 8 divisors (see below), whose sum is σ = 133215144. Its totient is φ = 22202520.

The previous prime is 66607553. The next prime is 66607573. The reversal of 66607566 is 66570666.

It is a sphenic number, since it is the product of 3 distinct primes.

66607566 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5550625 + ... + 5550636.

It is an arithmetic number, because the mean of its divisors is an integer number (16651893).

Almost surely, 2^66607566 is an apocalyptic number.

66607566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66607566 is a wasteful number, since it uses less digits than its factorization.

66607566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11101266.

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 66607566 is about 8161.3458448959. The cubic root of 66607566 is about 405.3602768824.

The spelling of 66607566 in words is "sixty-six million, six hundred seven thousand, five hundred sixty-six".