66985064 has 8 divisors (see below), whose sum is σ = 125597010. Its totient is φ = 33492528.

The previous prime is 66985043. The next prime is 66985069. The reversal of 66985064 is 46058966.

It can be written as a sum of positive squares in only one way, i.e., 58400164 + 8584900 = 7642^2 + 2930^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (66985069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4186559 + ... + 4186574.

Almost surely, 2^66985064 is an apocalyptic number.

It is an amenable number.

66985064 is a deficient number, since it is larger than the sum of its proper divisors (58611946).

66985064 is a wasteful number, since it uses less digits than its factorization.

66985064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8373139 (or 8373135 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 66985064 is about 8184.4403596092. The cubic root of 66985064 is about 406.1246270641.

The spelling of 66985064 in words is "sixty-six million, nine hundred eighty-five thousand, sixty-four".