73666573 has 4 divisors (see below), whose sum is σ = 73684188. Its totient is φ = 73648960.

The previous prime is 73666561. The next prime is 73666597. The reversal of 73666573 is 37566637.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37566637 = 31 ⋅1211827.

It can be written as a sum of positive squares in 2 ways, for example, as 14730244 + 58936329 = 3838^2 + 7677^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73666573 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 (73666513) 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, 1443 + ... + 12223.

It is an arithmetic number, because the mean of its divisors is an integer number (18421047).

Almost surely, 2^73666573 is an apocalyptic number.

It is an amenable number.

73666573 is a deficient number, since it is larger than the sum of its proper divisors (17615).

73666573 is a wasteful number, since it uses less digits than its factorization.

73666573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17614.

The product of its digits is 476280, while the sum is 43.

The square root of 73666573 is about 8582.9233364862. The cubic root of 73666573 is about 419.2021379673.

The spelling of 73666573 in words is "seventy-three million, six hundred sixty-six thousand, five hundred seventy-three".