66677666 has 8 divisors (see below), whose sum is σ = 109108944. Its totient is φ = 30308020.

The previous prime is 66677651. The next prime is 66677687.

66677666 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×66677666² = 8891822286415112, which contains 22 as substring.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515380 + ... + 1515423.

It is an arithmetic number, because the mean of its divisors is an integer number (13638618).

Almost surely, 2^66677666 is an apocalyptic number.

66677666 is a deficient number, since it is larger than the sum of its proper divisors (42431278).

66677666 is a wasteful number, since it uses less digits than its factorization.

66677666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030816.

The product of its digits is 2286144, while the sum is 50.

The square root of 66677666 is about 8165.6393503510. The cubic root of 66677666 is about 405.5024318676.

The spelling of 66677666 in words is "sixty-six million, six hundred seventy-seven thousand, six hundred sixty-six".