66994445 has 8 divisors (see below), whose sum is σ = 91878144. Its totient is φ = 45939024.

The previous prime is 66994429. The next prime is 66994453. The reversal of 66994445 is 54449966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66994445 - 2⁴ = 66994429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66994445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 957029 + ... + 957098.

It is an arithmetic number, because the mean of its divisors is an integer number (11484768).

Almost surely, 2^66994445 is an apocalyptic number.

It is an amenable number.

66994445 is a deficient number, since it is larger than the sum of its proper divisors (24883699).

66994445 is a wasteful number, since it uses less digits than its factorization.

66994445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914139.

The product of its digits is 933120, while the sum is 47.

The square root of 66994445 is about 8185.0134392070. The cubic root of 66994445 is about 406.1435849086.

The spelling of 66994445 in words is "sixty-six million, nine hundred ninety-four thousand, four hundred forty-five".