66668775 has 12 divisors (see below), whose sum is σ = 110225832. Its totient is φ = 35556640.

The previous prime is 66668731. The next prime is 66668803. The reversal of 66668775 is 57786666.

It is a happy number.

It is not a de Polignac number, because 66668775 - 2⁸ = 66668519 is a prime.

It is a congruent number.

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, 444384 + ... + 444533.

It is an arithmetic number, because the mean of its divisors is an integer number (9185486).

Almost surely, 2^66668775 is an apocalyptic number.

66668775 is a deficient number, since it is larger than the sum of its proper divisors (43557057).

66668775 is a wasteful number, since it uses less digits than its factorization.

66668775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888930 (or 888925 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 51.

The square root of 66668775 is about 8165.0949167784. The cubic root of 66668775 is about 405.4844074296.

The spelling of 66668775 in words is "sixty-six million, six hundred sixty-eight thousand, seven hundred seventy-five".