801666489 has 8 divisors (see below), whose sum is σ = 1151110912. Its totient is φ = 493333200.

The previous prime is 801666473. The next prime is 801666527. The reversal of 801666489 is 984666108.

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

It is not a de Polignac number, because 801666489 - 2⁴ = 801666473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (801666289) 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, 10277737 + ... + 10277814.

It is an arithmetic number, because the mean of its divisors is an integer number (143888864).

Almost surely, 2^801666489 is an apocalyptic number.

It is an amenable number.

801666489 is a deficient number, since it is larger than the sum of its proper divisors (349444423).

801666489 is a wasteful number, since it uses less digits than its factorization.

801666489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20555567.

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 801666489 is about 28313.7155633096. The cubic root of 801666489 is about 928.9619160456.

The spelling of 801666489 in words is "eight hundred one million, six hundred sixty-six thousand, four hundred eighty-nine".