66196573 has 4 divisors (see below), whose sum is σ = 66393340. Its totient is φ = 65999808.

The previous prime is 66196561. The next prime is 66196597. The reversal of 66196573 is 37569166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21279769 + 44916804 = 4613^2 + 6702^2 .

It is a cyclic number.

It is not a de Polignac number, because 66196573 - 2⁵ = 66196541 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 (66196973) 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, 97878 + ... + 98551.

It is an arithmetic number, because the mean of its divisors is an integer number (16598335).

Almost surely, 2^66196573 is an apocalyptic number.

It is an amenable number.

66196573 is a deficient number, since it is larger than the sum of its proper divisors (196767).

66196573 is a wasteful number, since it uses less digits than its factorization.

66196573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196766.

The product of its digits is 204120, while the sum is 43.

The square root of 66196573 is about 8136.1276415750. The cubic root of 66196573 is about 404.5248158519.

The spelling of 66196573 in words is "sixty-six million, one hundred ninety-six thousand, five hundred seventy-three".