66372169 has 2 divisors, whose sum is σ = 66372170. Its totient is φ = 66372168.

The previous prime is 66372161. The next prime is 66372197. The reversal of 66372169 is 96127366.

66372169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63441225 + 2930944 = 7965^2 + 1712^2 .

It is a cyclic number.

It is not a de Polignac number, because 66372169 - 2³ = 66372161 is a prime.

It is a super-2 number, since 2×66372169² = 8810529635529122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66372161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33186084 + 33186085.

It is an arithmetic number, because the mean of its divisors is an integer number (33186085).

Almost surely, 2^66372169 is an apocalyptic number.

It is an amenable number.

66372169 is a deficient number, since it is larger than the sum of its proper divisors (1).

66372169 is an equidigital number, since it uses as much as digits as its factorization.

66372169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 66372169 is about 8146.9116234313. The cubic root of 66372169 is about 404.8821869380.

The spelling of 66372169 in words is "sixty-six million, three hundred seventy-two thousand, one hundred sixty-nine".