66429957 has 16 divisors (see below), whose sum is σ = 100827648. Its totient is φ = 38509680.

The previous prime is 66429949. The next prime is 66429967. The reversal of 66429957 is 75992466.

66429957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66429957 - 2³ = 66429949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66429917) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 43003 + ... + 44520.

It is an arithmetic number, because the mean of its divisors is an integer number (6301728).

Almost surely, 2^66429957 is an apocalyptic number.

It is an amenable number.

66429957 is a deficient number, since it is larger than the sum of its proper divisors (34397691).

66429957 is a wasteful number, since it uses less digits than its factorization.

66429957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87560.

The product of its digits is 816480, while the sum is 48.

The square root of 66429957 is about 8150.4574718233. The cubic root of 66429957 is about 404.9996585883. Note that the first 3 decimals are identical.

The spelling of 66429957 in words is "sixty-six million, four hundred twenty-nine thousand, nine hundred fifty-seven".