66669289 has 8 divisors (see below), whose sum is σ = 69264000. Its totient is φ = 64094352.

The previous prime is 66669287. The next prime is 66669293. The reversal of 66669289 is 98296666.

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 66669289 - 2¹ = 66669287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66669287) 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, 2122 + ... + 11740.

It is an arithmetic number, because the mean of its divisors is an integer number (8658000).

Almost surely, 2^66669289 is an apocalyptic number.

It is an amenable number.

66669289 is a deficient number, since it is larger than the sum of its proper divisors (2594711).

66669289 is a wasteful number, since it uses less digits than its factorization.

66669289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9887.

The product of its digits is 1679616, while the sum is 52.

The square root of 66669289 is about 8165.1263921632. The cubic root of 66669289 is about 405.4854494889.

The spelling of 66669289 in words is "sixty-six million, six hundred sixty-nine thousand, two hundred eighty-nine".