66426666 has 16 divisors (see below), whose sum is σ = 132941088. Its totient is φ = 22127600.

The previous prime is 66426653. The next prime is 66426673. The reversal of 66426666 is 66662466.

It is a happy number.

66426666 is a modest number, since divided by 6666 gives 6642 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10261 + ... + 15431.

It is an arithmetic number, because the mean of its divisors is an integer number (8308818).

Almost surely, 2^66426666 is an apocalyptic number.

66426666 is an abundant number, since it is smaller than the sum of its proper divisors (66514422).

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

66426666 is a wasteful number, since it uses less digits than its factorization.

66426666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7317.

The product of its digits is 373248, while the sum is 42.

The square root of 66426666 is about 8150.2555788147. The cubic root of 66426666 is about 404.9929704617.

The spelling of 66426666 in words is "sixty-six million, four hundred twenty-six thousand, six hundred sixty-six".