66165937 has 2 divisors, whose sum is σ = 66165938. Its totient is φ = 66165936.

The previous prime is 66165929. The next prime is 66165971. The reversal of 66165937 is 73956166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65950641 + 215296 = 8121^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 66165937 - 2³ = 66165929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66165893 and 66165902.

It is not a weakly prime, because it can be changed into another prime (66165977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082968 + 33082969.

It is an arithmetic number, because the mean of its divisors is an integer number (33082969).

Almost surely, 2^66165937 is an apocalyptic number.

It is an amenable number.

66165937 is a deficient number, since it is larger than the sum of its proper divisors (1).

66165937 is an equidigital number, since it uses as much as digits as its factorization.

66165937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 43.

The square root of 66165937 is about 8134.2447098670. The cubic root of 66165937 is about 404.4624010670.

The spelling of 66165937 in words is "sixty-six million, one hundred sixty-five thousand, nine hundred thirty-seven".