66126666 has 16 divisors (see below), whose sum is σ = 132349824. Its totient is φ = 22026144.

The previous prime is 66126637. The next prime is 66126667. The reversal of 66126666 is 66662166.

It is a nude number because it is divisible by every one of its digits.

66126666 is a modest number, since divided by 6666 gives 6612 as remainder.

It is not an unprimeable number, because it can be changed into a prime (66126667) 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, 7375 + ... + 13661.

It is an arithmetic number, because the mean of its divisors is an integer number (8271864).

Almost surely, 2^66126666 is an apocalyptic number.

66126666 is an abundant number, since it is smaller than the sum of its proper divisors (66223158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66126666 is a wasteful number, since it uses less digits than its factorization.

66126666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8045.

The product of its digits is 93312, while the sum is 39.

The square root of 66126666 is about 8131.8304212520. The cubic root of 66126666 is about 404.3823659959.

The spelling of 66126666 in words is "sixty-six million, one hundred twenty-six thousand, six hundred sixty-six".