667089231821 has 8 divisors (see below), whose sum is σ = 667725711840. Its totient is φ = 666452879568.

The previous prime is 667089231797. The next prime is 667089231857. The reversal of 667089231821 is 128132980766.

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 667089231821 - 2³⁴ = 649909362637 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 (667089231871) 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, 12837590 + ... + 12889448.

It is an arithmetic number, because the mean of its divisors is an integer number (83465713980).

Almost surely, 2^667089231821 is an apocalyptic number.

It is an amenable number.

667089231821 is a deficient number, since it is larger than the sum of its proper divisors (636480019).

667089231821 is a wasteful number, since it uses less digits than its factorization.

667089231821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63883.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 667089231821 in words is "six hundred sixty-seven billion, eighty-nine million, two hundred thirty-one thousand, eight hundred twenty-one".