66442266 has 24 divisors (see below), whose sum is σ = 157045824. Its totient is φ = 20133960.

The previous prime is 66442261. The next prime is 66442279. The reversal of 66442266 is 66224466.

66442266 is a `hidden beast` number, since 6 + 644 + 2 + 2 + 6 + 6 = 666.

It is a super-2 number, since 2×66442266² = 8829149422429512, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66442266.

It is not an unprimeable number, because it can be changed into a prime (66442261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167586 + ... + 167981.

It is an arithmetic number, because the mean of its divisors is an integer number (6543576).

Almost surely, 2^66442266 is an apocalyptic number.

66442266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66442266 is an abundant number, since it is smaller than the sum of its proper divisors (90603558).

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

66442266 is a wasteful number, since it uses less digits than its factorization.

66442266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335586 (or 335583 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 66442266 is about 8151.2125478361. The cubic root of 66442266 is about 405.0246715652.

The spelling of 66442266 in words is "sixty-six million, four hundred forty-two thousand, two hundred sixty-six".