66115017 has 6 divisors (see below), whose sum is σ = 95499482. Its totient is φ = 44076672.

The previous prime is 66115013. The next prime is 66115039. The reversal of 66115017 is 71051166.

It can be written as a sum of positive squares in only one way, i.e., 57699216 + 8415801 = 7596^2 + 2901^2 .

It is not a de Polignac number, because 66115017 - 2² = 66115013 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66115013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3673048 + ... + 3673065.

Almost surely, 2^66115017 is an apocalyptic number.

It is an amenable number.

66115017 is a deficient number, since it is larger than the sum of its proper divisors (29384465).

66115017 is a wasteful number, since it uses less digits than its factorization.

66115017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7346119 (or 7346116 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 66115017 is about 8131.1141303022. The cubic root of 66115017 is about 404.3586190110.

It can be divided in two parts, 6611 and 5017, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 66115017 in words is "sixty-six million, one hundred fifteen thousand, seventeen".