66800866 has 16 divisors (see below), whose sum is σ = 109446048. Its totient is φ = 30326400.

The previous prime is 66800863. The next prime is 66800869.

66800866 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (66800863) and next prime (66800869).

It is not an unprimeable number, because it can be changed into a prime (66800863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24466 + ... + 27058.

It is an arithmetic number, because the mean of its divisors is an integer number (6840378).

Almost surely, 2^66800866 is an apocalyptic number.

66800866 is a deficient number, since it is larger than the sum of its proper divisors (42645182).

66800866 is a wasteful number, since it uses less digits than its factorization.

66800866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 66800866 is about 8173.1796750102. The cubic root of 66800866 is about 405.7520264978.

The spelling of 66800866 in words is "sixty-six million, eight hundred thousand, eight hundred sixty-six".