66172023 has 6 divisors (see below), whose sum is σ = 95581824. Its totient is φ = 44114676.

The previous prime is 66172019. The next prime is 66172027. The reversal of 66172023 is 32027166.

It is a happy number.

66172023 is a `hidden beast` number, since 6 + 617 + 20 + 23 = 666.

It is an interprime number because it is at equal distance from previous prime (66172019) and next prime (66172027).

It is not a de Polignac number, because 66172023 - 2² = 66172019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66172027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3676215 + ... + 3676232.

It is an arithmetic number, because the mean of its divisors is an integer number (15930304).

Almost surely, 2^66172023 is an apocalyptic number.

66172023 is a deficient number, since it is larger than the sum of its proper divisors (29409801).

66172023 is a wasteful number, since it uses less digits than its factorization.

66172023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7352453 (or 7352450 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 66172023 is about 8134.6187986900. The cubic root of 66172023 is about 404.4748016204.

Adding to 66172023 its reverse (32027166), we get a palindrome (98199189).

The spelling of 66172023 in words is "sixty-six million, one hundred seventy-two thousand, twenty-three".