66673745 has 12 divisors (see below), whose sum is σ = 84993564. Its totient is φ = 50200320.

The previous prime is 66673723. The next prime is 66673751. The reversal of 66673745 is 54737666.

It can be written as a sum of positive squares in 6 ways, for example, as 71824 + 66601921 = 268^2 + 8161^2 .

It is not a de Polignac number, because 66673745 - 2¹⁰ = 66672721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66673696 and 66673705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21626 + ... + 24515.

It is an arithmetic number, because the mean of its divisors is an integer number (7082797).

Almost surely, 2^66673745 is an apocalyptic number.

It is an amenable number.

66673745 is a deficient number, since it is larger than the sum of its proper divisors (18319819).

66673745 is a wasteful number, since it uses less digits than its factorization.

66673745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46180 (or 46163 counting only the distinct ones).

The product of its digits is 635040, while the sum is 44.

The square root of 66673745 is about 8165.3992553947. The cubic root of 66673745 is about 405.4944831481.

The spelling of 66673745 in words is "sixty-six million, six hundred seventy-three thousand, seven hundred forty-five".