66677812 has 6 divisors (see below), whose sum is σ = 116686178. Its totient is φ = 33338904.

The previous prime is 66677789. The next prime is 66677813. The reversal of 66677812 is 21877666.

It can be written as a sum of positive squares in only one way, i.e., 66487716 + 190096 = 8154^2 + 436^2 .

It is a super-2 number, since 2×66677812² = 8891861226214688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334723 + ... + 8334730.

Almost surely, 2^66677812 is an apocalyptic number.

It is an amenable number.

66677812 is a deficient number, since it is larger than the sum of its proper divisors (50008366).

66677812 is a wasteful number, since it uses less digits than its factorization.

66677812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16669457 (or 16669455 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 66677812 is about 8165.6482902462. The cubic root of 66677812 is about 405.5027278354.

The spelling of 66677812 in words is "sixty-six million, six hundred seventy-seven thousand, eight hundred twelve".