66976881 has 16 divisors (see below), whose sum is σ = 94248000. Its totient is φ = 42190848.

The previous prime is 66976867. The next prime is 66976909. The reversal of 66976881 is 18867966.

It is a happy number.

It is not a de Polignac number, because 66976881 - 2⁵ = 66976849 is a prime.

It is a super-2 number, since 2×66976881² = 8971805176976322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66976181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24285 + ... + 26901.

It is an arithmetic number, because the mean of its divisors is an integer number (5890500).

Almost surely, 2^66976881 is an apocalyptic number.

It is an amenable number.

66976881 is a deficient number, since it is larger than the sum of its proper divisors (27271119).

66976881 is a wasteful number, since it uses less digits than its factorization.

66976881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3088.

The product of its digits is 870912, while the sum is 51.

The square root of 66976881 is about 8183.9404323345. The cubic root of 66976881 is about 406.1080887844.

The spelling of 66976881 in words is "sixty-six million, nine hundred seventy-six thousand, eight hundred eighty-one".