66880395 has 24 divisors (see below), whose sum is σ = 116397216. Its totient is φ = 35524608.

The previous prime is 66880391. The next prime is 66880417. The reversal of 66880395 is 59308866.

66880395 is a nontrivial binomial coefficient, being equal to C(11566, 2).

It is not a de Polignac number, because 66880395 - 2² = 66880391 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66880395.

It is not an unprimeable number, because it can be changed into a prime (66880391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8674 + ... + 14456.

It is an arithmetic number, because the mean of its divisors is an integer number (4849884).

Almost surely, 2^66880395 is an apocalyptic number.

66880395 is the 11565-th triangular number and also the 5783-rd hexagonal number.

66880395 is a deficient number, since it is larger than the sum of its proper divisors (49516821).

66880395 is a wasteful number, since it uses less digits than its factorization.

66880395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6051 (or 6048 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 66880395 is about 8178.0434701706. The cubic root of 66880395 is about 405.9129837701.

The spelling of 66880395 in words is "sixty-six million, eight hundred eighty thousand, three hundred ninety-five".