66877666 has 8 divisors (see below), whose sum is σ = 100365660. Its totient is φ = 33422448.

The previous prime is 66877661. The next prime is 66877691. The reversal of 66877666 is 66677866.

It can be written as a sum of positive squares in 2 ways, for example, as 65367225 + 1510441 = 8085^2 + 1229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66877661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2221 + ... + 11776.

Almost surely, 2^66877666 is an apocalyptic number.

66877666 is a deficient number, since it is larger than the sum of its proper divisors (33487994).

66877666 is a wasteful number, since it uses less digits than its factorization.

66877666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16388.

The product of its digits is 3048192, while the sum is 52.

The square root of 66877666 is about 8177.8766192698. The cubic root of 66877666 is about 405.9074627122.

The spelling of 66877666 in words is "sixty-six million, eight hundred seventy-seven thousand, six hundred sixty-six".