66430123 has 4 divisors (see below), whose sum is σ = 66478680. Its totient is φ = 66381568.

The previous prime is 66430121. The next prime is 66430163. The reversal of 66430123 is 32103466.

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

It is a cyclic number.

It is not a de Polignac number, because 66430123 - 2¹ = 66430121 is a prime.

It is a super-2 number, since 2×66430123² = 8825922483590258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66430121) 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, 22165 + ... + 24982.

It is an arithmetic number, because the mean of its divisors is an integer number (16619670).

Almost surely, 2^66430123 is an apocalyptic number.

66430123 is a deficient number, since it is larger than the sum of its proper divisors (48557).

66430123 is a wasteful number, since it uses less digits than its factorization.

66430123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48556.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 66430123 is about 8150.4676552944. The cubic root of 66430123 is about 404.9999959356. Note that the first 5 decimals are identical.

Adding to 66430123 its reverse (32103466), we get a palindrome (98533589).

The spelling of 66430123 in words is "sixty-six million, four hundred thirty thousand, one hundred twenty-three".