666226644 has 24 divisors (see below), whose sum is σ = 1558341120. Its totient is φ = 221530944.

The previous prime is 666226637. The next prime is 666226661. The reversal of 666226644 is 446622666.

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

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 666226596 and 666226605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62964 + ... + 72779.

It is an arithmetic number, because the mean of its divisors is an integer number (64930880).

Almost surely, 2^666226644 is an apocalyptic number.

It is an amenable number.

666226644 is an abundant number, since it is smaller than the sum of its proper divisors (892114476).

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

666226644 is a wasteful number, since it uses less digits than its factorization.

666226644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136159 (or 136157 counting only the distinct ones).

The product of its digits is 497664, while the sum is 42.

The square root of 666226644 is about 25811.3665659143. The cubic root of 666226644 is about 873.3882248323.

The spelling of 666226644 in words is "six hundred sixty-six million, two hundred twenty-six thousand, six hundred forty-four".