66803989 has 8 divisors (see below), whose sum is σ = 77641920. Its totient is φ = 56289696.

The previous prime is 66803963. The next prime is 66804011. The reversal of 66803989 is 98930866.

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 66803989 - 2⁷ = 66803861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66803959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80464 + ... + 81289.

It is an arithmetic number, because the mean of its divisors is an integer number (9705240).

Almost surely, 2^66803989 is an apocalyptic number.

It is an amenable number.

66803989 is a deficient number, since it is larger than the sum of its proper divisors (10837931).

66803989 is a wasteful number, since it uses less digits than its factorization.

66803989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161819.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 66803989 is about 8173.3707244930. The cubic root of 66803989 is about 405.7583494889.

The spelling of 66803989 in words is "sixty-six million, eight hundred three thousand, nine hundred eighty-nine".