66429911 has 16 divisors (see below), whose sum is σ = 71705088. Its totient is φ = 61380000.

The previous prime is 66429893. The next prime is 66429917. The reversal of 66429911 is 11992466.

It is a cyclic number.

It is not a de Polignac number, because 66429911 - 2¹⁸ = 66167767 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213446 + ... + 213756.

It is an arithmetic number, because the mean of its divisors is an integer number (4481568).

Almost surely, 2^66429911 is an apocalyptic number.

66429911 is a deficient number, since it is larger than the sum of its proper divisors (5275177).

66429911 is a wasteful number, since it uses less digits than its factorization.

66429911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622.

The product of its digits is 23328, while the sum is 38.

The square root of 66429911 is about 8150.4546498953. The cubic root of 66429911 is about 404.9995651065. Note that the first 3 decimals are identical.

The spelling of 66429911 in words is "sixty-six million, four hundred twenty-nine thousand, nine hundred eleven".