129226666 has 8 divisors (see below), whose sum is σ = 194035140. Its totient is φ = 64548288.

The previous prime is 129226649. The next prime is 129226679. The reversal of 129226666 is 666622921.

It can be written as a sum of positive squares in 2 ways, for example, as 107557641 + 21669025 = 10371^2 + 4655^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30001 + ... + 34036.

Almost surely, 2^129226666 is an apocalyptic number.

129226666 is a deficient number, since it is larger than the sum of its proper divisors (64808474).

129226666 is a wasteful number, since it uses less digits than its factorization.

129226666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65048.

The product of its digits is 93312, while the sum is 40.

The square root of 129226666 is about 11367.7907264341. The cubic root of 129226666 is about 505.5732026811.

The spelling of 129226666 in words is "one hundred twenty-nine million, two hundred twenty-six thousand, six hundred sixty-six".