66605750 has 32 divisors (see below), whose sum is σ = 128999520. Its totient is φ = 25720800.

The previous prime is 66605713. The next prime is 66605761. The reversal of 66605750 is 5750666.

It is a self number, because there is not a number n which added to its sum of digits gives 66605750.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2657 + ... + 11843.

It is an arithmetic number, because the mean of its divisors is an integer number (4031235).

Almost surely, 2^66605750 is an apocalyptic number.

66605750 is a deficient number, since it is larger than the sum of its proper divisors (62393770).

66605750 is a wasteful number, since it uses less digits than its factorization.

66605750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9233 (or 9223 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 66605750 is about 8161.2345879775. The cubic root of 66605750 is about 405.3565929118.

The spelling of 66605750 in words is "sixty-six million, six hundred five thousand, seven hundred fifty".