66851023 has 2 divisors, whose sum is σ = 66851024. Its totient is φ = 66851022.

The previous prime is 66851009. The next prime is 66851039. The reversal of 66851023 is 32015866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66851023 is a prime.

It is a super-2 number, since 2×66851023² = 8938118552293058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66851053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33425511 + 33425512.

It is an arithmetic number, because the mean of its divisors is an integer number (33425512).

Almost surely, 2^66851023 is an apocalyptic number.

66851023 is a deficient number, since it is larger than the sum of its proper divisors (1).

66851023 is an equidigital number, since it uses as much as digits as its factorization.

66851023 is an odious number, because the sum of its binary digits is odd.

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

The square root of 66851023 is about 8176.2474889157. The cubic root of 66851023 is about 405.8535531904.

Adding to 66851023 its reverse (32015866), we get a palindrome (98866889).

The spelling of 66851023 in words is "sixty-six million, eight hundred fifty-one thousand, twenty-three".