66407123 has 4 divisors (see below), whose sum is σ = 66546240. Its totient is φ = 66268008.

The previous prime is 66407069. The next prime is 66407189. The reversal of 66407123 is 32170466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66407123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66407723) 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, 68840 + ... + 69797.

It is an arithmetic number, because the mean of its divisors is an integer number (16636560).

Almost surely, 2^66407123 is an apocalyptic number.

66407123 is a deficient number, since it is larger than the sum of its proper divisors (139117).

66407123 is a wasteful number, since it uses less digits than its factorization.

66407123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139116.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 66407123 is about 8149.0565711621. The cubic root of 66407123 is about 404.9532496969.

Adding to 66407123 its reverse (32170466), we get a palindrome (98577589).

The spelling of 66407123 in words is "sixty-six million, four hundred seven thousand, one hundred twenty-three".