66880869 has 16 divisors (see below), whose sum is σ = 97794624. Its totient is φ = 40320000.

The previous prime is 66880843. The next prime is 66880889. The reversal of 66880869 is 96808866.

It is not a de Polignac number, because 66880869 - 2⁹ = 66880357 is a prime.

It is a super-2 number, since 2×66880869² = 8946101276390322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66880889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1119 + ... + 11619.

It is an arithmetic number, because the mean of its divisors is an integer number (6112164).

Almost surely, 2^66880869 is an apocalyptic number.

It is an amenable number.

66880869 is a deficient number, since it is larger than the sum of its proper divisors (30913755).

66880869 is a wasteful number, since it uses less digits than its factorization.

66880869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10708.

The product of its (nonzero) digits is 995328, while the sum is 51.

The square root of 66880869 is about 8178.0724501560. The cubic root of 66880869 is about 405.9139427073.

The spelling of 66880869 in words is "sixty-six million, eight hundred eighty thousand, eight hundred sixty-nine".