129919666 has 8 divisors (see below), whose sum is σ = 196888860. Its totient is φ = 64290048.

The previous prime is 129919613. The next prime is 129919733. The reversal of 129919666 is 666919921.

It can be written as a sum of positive squares in 2 ways, for example, as 110691441 + 19228225 = 10521^2 + 4385^2 .

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

It is a super-2 number, since 2×129919666² = 33758239227103112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334651 + ... + 335038.

Almost surely, 2^129919666 is an apocalyptic number.

129919666 is a deficient number, since it is larger than the sum of its proper divisors (66969194).

129919666 is an equidigital number, since it uses as much as digits as its factorization.

129919666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669788.

The product of its digits is 314928, while the sum is 49.

The square root of 129919666 is about 11398.2308276329. The cubic root of 129919666 is about 506.4753327836.

The spelling of 129919666 in words is "one hundred twenty-nine million, nine hundred nineteen thousand, six hundred sixty-six".