66880873 has 8 divisors (see below), whose sum is σ = 73257480. Its totient is φ = 60775680.

The previous prime is 66880843. The next prime is 66880889. The reversal of 66880873 is 37808866.

It can be written as a sum of positive squares in 4 ways, for example, as 8082649 + 58798224 = 2843^2 + 7668^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66880873 - 2⁵ = 66880841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66880843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67338 + ... + 68323.

It is an arithmetic number, because the mean of its divisors is an integer number (9157185).

Almost surely, 2^66880873 is an apocalyptic number.

It is an amenable number.

66880873 is a deficient number, since it is larger than the sum of its proper divisors (6376607).

66880873 is a wasteful number, since it uses less digits than its factorization.

66880873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135707.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 66880873 is about 8178.0726947124. The cubic root of 66880873 is about 405.9139507996.

The spelling of 66880873 in words is "sixty-six million, eight hundred eighty thousand, eight hundred seventy-three".