66508123 has 4 divisors (see below), whose sum is σ = 72554328. Its totient is φ = 60461920.

The previous prime is 66508121. The next prime is 66508133. The reversal of 66508123 is 32180566.

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 66508123 - 2¹ = 66508121 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66508121) 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, 3023086 + ... + 3023107.

It is an arithmetic number, because the mean of its divisors is an integer number (18138582).

Almost surely, 2^66508123 is an apocalyptic number.

66508123 is a deficient number, since it is larger than the sum of its proper divisors (6046205).

66508123 is a wasteful number, since it uses less digits than its factorization.

66508123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6046204.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 66508123 is about 8155.2512530271. The cubic root of 66508123 is about 405.1584463611.

Adding to 66508123 its reverse (32180566), we get a palindrome (98688689).

The spelling of 66508123 in words is "sixty-six million, five hundred eight thousand, one hundred twenty-three".