66681044 has 12 divisors (see below), whose sum is σ = 116758068. Its totient is φ = 33321600.

The previous prime is 66681037. The next prime is 66681053. The reversal of 66681044 is 44018666.

It can be written as a sum of positive squares in 2 ways, for example, as 17960644 + 48720400 = 4238^2 + 6980^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66680995 and 66681013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5804 + ... + 12924.

It is an arithmetic number, because the mean of its divisors is an integer number (9729839).

Almost surely, 2^66681044 is an apocalyptic number.

It is an amenable number.

66681044 is a deficient number, since it is larger than the sum of its proper divisors (50077024).

66681044 is a wasteful number, since it uses less digits than its factorization.

66681044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9466 (or 9464 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 66681044 is about 8165.8461900773. The cubic root of 66681044 is about 405.5092795582.

The spelling of 66681044 in words is "sixty-six million, six hundred eighty-one thousand, forty-four".