66750285 has 32 divisors (see below), whose sum is σ = 126001152. Its totient is φ = 29528640.

The previous prime is 66750269. The next prime is 66750329. The reversal of 66750285 is 58205766.

It is a happy number.

It is not a de Polignac number, because 66750285 - 2⁴ = 66750269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6999 + ... + 13508.

It is an arithmetic number, because the mean of its divisors is an integer number (3937536).

Almost surely, 2^66750285 is an apocalyptic number.

It is an amenable number.

66750285 is a deficient number, since it is larger than the sum of its proper divisors (59250867).

66750285 is a wasteful number, since it uses less digits than its factorization.

66750285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20553.

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 66750285 is about 8170.0847608822. The cubic root of 66750285 is about 405.6495900740.

The spelling of 66750285 in words is "sixty-six million, seven hundred fifty thousand, two hundred eighty-five".