667997673 has 8 divisors (see below), whose sum is σ = 1017901248. Its totient is φ = 381712944.

The previous prime is 667997663. The next prime is 667997723. The reversal of 667997673 is 376799766.

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

It is not a de Polignac number, because 667997673 - 2⁴ = 667997657 is a prime.

It is a super-2 number, since 2×667997673² = 892441782266829858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667997633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15904686 + ... + 15904727.

It is an arithmetic number, because the mean of its divisors is an integer number (127237656).

Almost surely, 2^667997673 is an apocalyptic number.

It is an amenable number.

667997673 is a deficient number, since it is larger than the sum of its proper divisors (349903575).

667997673 is a wasteful number, since it uses less digits than its factorization.

667997673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31809423.

The product of its digits is 18003384, while the sum is 60.

The square root of 667997673 is about 25845.6509494344. The cubic root of 667997673 is about 874.1614488265.

The spelling of 667997673 in words is "six hundred sixty-seven million, nine hundred ninety-seven thousand, six hundred seventy-three".