66165101 has 2 divisors, whose sum is σ = 66165102. Its totient is φ = 66165100.

The previous prime is 66165097. The next prime is 66165119. The reversal of 66165101 is 10156166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66031876 + 133225 = 8126^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 66165101 - 2² = 66165097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66165131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082550 + 33082551.

It is an arithmetic number, because the mean of its divisors is an integer number (33082551).

Almost surely, 2^66165101 is an apocalyptic number.

It is an amenable number.

66165101 is a deficient number, since it is larger than the sum of its proper divisors (1).

66165101 is an equidigital number, since it uses as much as digits as its factorization.

66165101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 66165101 is about 8134.1933220203. The cubic root of 66165101 is about 404.4606976125.

It can be divided in two parts, 66165 and 101, that added together give a palindrome (66266).

The spelling of 66165101 in words is "sixty-six million, one hundred sixty-five thousand, one hundred one".