65166197 has 2 divisors, whose sum is σ = 65166198. Its totient is φ = 65166196.

The previous prime is 65166187. The next prime is 65166209. The reversal of 65166197 is 79166156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44609041 + 20557156 = 6679^2 + 4534^2 .

It is a cyclic number.

It is not a de Polignac number, because 65166197 - 2⁶ = 65166133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65166187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32583098 + 32583099.

It is an arithmetic number, because the mean of its divisors is an integer number (32583099).

Almost surely, 2^65166197 is an apocalyptic number.

It is an amenable number.

65166197 is a deficient number, since it is larger than the sum of its proper divisors (1).

65166197 is an equidigital number, since it uses as much as digits as its factorization.

65166197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 65166197 is about 8072.5582686036. The cubic root of 65166197 is about 402.4149675702.

Subtracting from 65166197 its sum of digits (41), we obtain a palindrome (65166156).

The spelling of 65166197 in words is "sixty-five million, one hundred sixty-six thousand, one hundred ninety-seven".