66666010 has 16 divisors (see below), whose sum is σ = 127057896. Its totient is φ = 25097728.

The previous prime is 66666007. The next prime is 66666011. The reversal of 66666010 is 1066666.

It can be written as a sum of positive squares in 4 ways, for example, as 65561409 + 1104601 = 8097^2 + 1051^2 .

It is not an unprimeable number, because it can be changed into a prime (66666011) 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, 195907 + ... + 196246.

Almost surely, 2^66666010 is an apocalyptic number.

66666010 is a deficient number, since it is larger than the sum of its proper divisors (60391886).

66666010 is a wasteful number, since it uses less digits than its factorization.

66666010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392177.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 66666010 is about 8164.9255967216. The cubic root of 66666010 is about 405.4788017074.

The spelling of 66666010 in words is "sixty-six million, six hundred sixty-six thousand, ten".