66886866 has 24 divisors (see below), whose sum is σ = 147299724. Its totient is φ = 21929760.

The previous prime is 66886849. The next prime is 66886903. The reversal of 66886866 is 66868866.

It can be written as a sum of positive squares in 2 ways, for example, as 49070025 + 17816841 = 7005^2 + 4221^2 .

It is a Curzon 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, 29361 + ... + 31556.

Almost surely, 2^66886866 is an apocalyptic number.

66886866 is an abundant number, since it is smaller than the sum of its proper divisors (80412858).

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

66886866 is a wasteful number, since it uses less digits than its factorization.

66886866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60986 (or 60983 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The square root of 66886866 is about 8178.4390931277. The cubic root of 66886866 is about 405.9260746926.

The spelling of 66886866 in words is "sixty-six million, eight hundred eighty-six thousand, eight hundred sixty-six".