66405066 has 32 divisors (see below), whose sum is σ = 163459968. Its totient is φ = 17513280.

The previous prime is 66405061. The next prime is 66405067. The reversal of 66405066 is 66050466.

It is not an unprimeable number, because it can be changed into a prime (66405061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60265 + ... + 61356.

It is an arithmetic number, because the mean of its divisors is an integer number (5108124).

Almost surely, 2^66405066 is an apocalyptic number.

66405066 is an abundant number, since it is smaller than the sum of its proper divisors (97054902).

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

66405066 is a wasteful number, since it uses less digits than its factorization.

66405066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121646.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 66405066 is about 8148.9303592557. The cubic root of 66405066 is about 404.9490684314.

The spelling of 66405066 in words is "sixty-six million, four hundred five thousand, sixty-six".