66493249 has 4 divisors (see below), whose sum is σ = 67151700. Its totient is φ = 65834800.

The previous prime is 66493243. The next prime is 66493313. The reversal of 66493249 is 94239466.

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 28547649 + 37945600 = 5343^2 + 6160^2 .

It is a cyclic number.

It is not a de Polignac number, because 66493249 - 2²¹ = 64396097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66493243) 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, 329074 + ... + 329275.

It is an arithmetic number, because the mean of its divisors is an integer number (16787925).

Almost surely, 2^66493249 is an apocalyptic number.

It is an amenable number.

66493249 is a deficient number, since it is larger than the sum of its proper divisors (658451).

66493249 is a wasteful number, since it uses less digits than its factorization.

66493249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658450.

The product of its digits is 279936, while the sum is 43.

The square root of 66493249 is about 8154.3392742760. The cubic root of 66493249 is about 405.1282406471.

The spelling of 66493249 in words is "sixty-six million, four hundred ninety-three thousand, two hundred forty-nine".