66745886 has 4 divisors (see below), whose sum is σ = 100118832. Its totient is φ = 33372942.

The previous prime is 66745873. The next prime is 66745963. The reversal of 66745886 is 68854766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68854766 = 2 ⋅34427383.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16686470 + ... + 16686473.

It is an arithmetic number, because the mean of its divisors is an integer number (25029708).

Almost surely, 2^66745886 is an apocalyptic number.

66745886 is a deficient number, since it is larger than the sum of its proper divisors (33372946).

66745886 is a wasteful number, since it uses less digits than its factorization.

66745886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33372945.

The product of its digits is 1935360, while the sum is 50.

The square root of 66745886 is about 8169.8155425934. The cubic root of 66745886 is about 405.6406787925.

The spelling of 66745886 in words is "sixty-six million, seven hundred forty-five thousand, eight hundred eighty-six".