66662866 has 8 divisors (see below), whose sum is σ = 100033164. Its totient is φ = 33318480.

The previous prime is 66662837. The next prime is 66662941. The reversal of 66662866 is 66826666.

It can be written as a sum of positive squares in 2 ways, for example, as 59613841 + 7049025 = 7721^2 + 2655^2 .

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

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, 2376 + ... + 11788.

Almost surely, 2^66662866 is an apocalyptic number.

66662866 is a deficient number, since it is larger than the sum of its proper divisors (33370298).

66662866 is a wasteful number, since it uses less digits than its factorization.

66662866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12956.

The product of its digits is 746496, while the sum is 46.

The square root of 66662866 is about 8164.7330636096. The cubic root of 66662866 is about 405.4724274177.

It can be divided in two parts, 66662 and 866, that added together give a triangular number (67528 = T₃₆₇).

The spelling of 66662866 in words is "sixty-six million, six hundred sixty-two thousand, eight hundred sixty-six".