66429992 has 8 divisors (see below), whose sum is σ = 124556250. Its totient is φ = 33214992.

The previous prime is 66429989. The next prime is 66430009. The reversal of 66429992 is 29992466.

66429992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 45508516 + 20921476 = 6746^2 + 4574^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4151867 + ... + 4151882.

Almost surely, 2^66429992 is an apocalyptic number.

It is an amenable number.

66429992 is a deficient number, since it is larger than the sum of its proper divisors (58126258).

66429992 is a wasteful number, since it uses less digits than its factorization.

66429992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8303755 (or 8303751 counting only the distinct ones).

The product of its digits is 419904, while the sum is 47.

The square root of 66429992 is about 8150.4596189417. The cubic root of 66429992 is about 404.9997297158. Note that the first 3 decimals are identical.

The spelling of 66429992 in words is "sixty-six million, four hundred twenty-nine thousand, nine hundred ninety-two".