66201673 has 4 divisors (see below), whose sum is σ = 66289428. Its totient is φ = 66113920.

The previous prime is 66201631. The next prime is 66201677. The reversal of 66201673 is 37610266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37610266 = 2 ⋅18805133.

It can be written as a sum of positive squares in 2 ways, for example, as 19784704 + 46416969 = 4448^2 + 6813^2 .

It is a cyclic number.

It is not a de Polignac number, because 66201673 - 2¹⁷ = 66070601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66201677) 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, 42736 + ... + 44257.

It is an arithmetic number, because the mean of its divisors is an integer number (16572357).

Almost surely, 2^66201673 is an apocalyptic number.

It is an amenable number.

66201673 is a deficient number, since it is larger than the sum of its proper divisors (87755).

66201673 is an equidigital number, since it uses as much as digits as its factorization.

66201673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87754.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66201673 is about 8136.4410524504. The cubic root of 66201673 is about 404.5352042224.

The spelling of 66201673 in words is "sixty-six million, two hundred one thousand, six hundred seventy-three".