66672973 has 4 divisors (see below), whose sum is σ = 67668160. Its totient is φ = 65677788.

The previous prime is 66672967. The next prime is 66673027. The reversal of 66672973 is 37927666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66672973 - 2⁵ = 66672941 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 (66672923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 497493 + ... + 497626.

It is an arithmetic number, because the mean of its divisors is an integer number (16917040).

Almost surely, 2^66672973 is an apocalyptic number.

It is an amenable number.

66672973 is a deficient number, since it is larger than the sum of its proper divisors (995187).

66672973 is an equidigital number, since it uses as much as digits as its factorization.

66672973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995186.

The product of its digits is 571536, while the sum is 46.

The square root of 66672973 is about 8165.3519826153. The cubic root of 66672973 is about 405.4929180995.

The spelling of 66672973 in words is "sixty-six million, six hundred seventy-two thousand, nine hundred seventy-three".