66880017 has 12 divisors (see below), whose sum is σ = 96763524. Its totient is φ = 44513280.

The previous prime is 66880001. The next prime is 66880031. The reversal of 66880017 is 71008866.

It can be written as a sum of positive squares in 2 ways, for example, as 62110161 + 4769856 = 7881^2 + 2184^2 .

It is not a de Polignac number, because 66880017 - 2⁴ = 66880001 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66880417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28 + ... + 11565.

It is an arithmetic number, because the mean of its divisors is an integer number (8063627).

Almost surely, 2^66880017 is an apocalyptic number.

It is an amenable number.

66880017 is a deficient number, since it is larger than the sum of its proper divisors (29883507).

66880017 is a wasteful number, since it uses less digits than its factorization.

66880017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12240 (or 12237 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 66880017 is about 8178.0203594758. The cubic root of 66880017 is about 405.9122190448.

The spelling of 66880017 in words is "sixty-six million, eight hundred eighty thousand, seventeen".