66429147 has 4 divisors (see below), whose sum is σ = 88572200. Its totient is φ = 44286096.

The previous prime is 66429119. The next prime is 66429151. The reversal of 66429147 is 74192466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66429147 - 2¹⁶ = 66363611 is a prime.

It is a super-2 number, since 2×66429147² = 8825663142295218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66429347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11071522 + ... + 11071527.

It is an arithmetic number, because the mean of its divisors is an integer number (22143050).

Almost surely, 2^66429147 is an apocalyptic number.

66429147 is a deficient number, since it is larger than the sum of its proper divisors (22143053).

66429147 is a wasteful number, since it uses less digits than its factorization.

66429147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22143052.

The product of its digits is 72576, while the sum is 39.

The square root of 66429147 is about 8150.4077812095. The cubic root of 66429147 is about 404.9980124883.

The spelling of 66429147 in words is "sixty-six million, four hundred twenty-nine thousand, one hundred forty-seven".