66881113 has 4 divisors (see below), whose sum is σ = 72025828. Its totient is φ = 61736400.

The previous prime is 66881063. The next prime is 66881117. The reversal of 66881113 is 31118866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15429184 + 51451929 = 3928^2 + 7173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66881113 is a prime.

It is a super-2 number, since 2×66881113² = 8946166552237538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66881117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2572338 + ... + 2572363.

It is an arithmetic number, because the mean of its divisors is an integer number (18006457).

Almost surely, 2^66881113 is an apocalyptic number.

It is an amenable number.

66881113 is a deficient number, since it is larger than the sum of its proper divisors (5144715).

66881113 is a wasteful number, since it uses less digits than its factorization.

66881113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5144714.

The product of its digits is 6912, while the sum is 34.

The square root of 66881113 is about 8178.0873680831. The cubic root of 66881113 is about 405.9144363357.

Adding to 66881113 its reverse (31118866), we get a palindrome (97999979).

The spelling of 66881113 in words is "sixty-six million, eight hundred eighty-one thousand, one hundred thirteen".