66891044 has 12 divisors (see below), whose sum is σ = 127701168. Its totient is φ = 30405000.

The previous prime is 66891043. The next prime is 66891053. The reversal of 66891044 is 44019866.

It is a junction number, because it is equal to n+sod(n) for n = 66890989 and 66891007.

It is not an unprimeable number, because it can be changed into a prime (66891043) 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, 760082 + ... + 760169.

It is an arithmetic number, because the mean of its divisors is an integer number (10641764).

Almost surely, 2^66891044 is an apocalyptic number.

It is an amenable number.

66891044 is a deficient number, since it is larger than the sum of its proper divisors (60810124).

66891044 is a wasteful number, since it uses less digits than its factorization.

66891044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520266 (or 1520264 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 66891044 is about 8178.6945168529. The cubic root of 66891044 is about 405.9345263959.

The spelling of 66891044 in words is "sixty-six million, eight hundred ninety-one thousand, forty-four".