66985416 has 48 divisors (see below), whose sum is σ = 181806300. Its totient is φ = 22280832.

The previous prime is 66985397. The next prime is 66985421. The reversal of 66985416 is 61458966.

It can be written as a sum of positive squares in 2 ways, for example, as 57062916 + 9922500 = 7554^2 + 3150^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53890 + ... + 55118.

Almost surely, 2^66985416 is an apocalyptic number.

It is an amenable number.

66985416 is an abundant number, since it is smaller than the sum of its proper divisors (114820884).

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

66985416 is a wasteful number, since it uses less digits than its factorization.

66985416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998 (or 1991 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 66985416 is about 8184.4618638002. The cubic root of 66985416 is about 406.1253384446.

The spelling of 66985416 in words is "sixty-six million, nine hundred eighty-five thousand, four hundred sixteen".