66253445 has 8 divisors (see below), whose sum is σ = 81004536. Its totient is φ = 52002496.

The previous prime is 66253433. The next prime is 66253459. The reversal of 66253445 is 54435266.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18671041 + 47582404 = 4321^2 + 6898^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66253445 - 2¹⁶ = 66187909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124742 + ... + 125271.

It is an arithmetic number, because the mean of its divisors is an integer number (10125567).

Almost surely, 2^66253445 is an apocalyptic number.

It is an amenable number.

66253445 is a deficient number, since it is larger than the sum of its proper divisors (14751091).

66253445 is a wasteful number, since it uses less digits than its factorization.

66253445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250071.

The product of its digits is 86400, while the sum is 35.

The square root of 66253445 is about 8139.6219199666. The cubic root of 66253445 is about 404.6406302561.

The spelling of 66253445 in words is "sixty-six million, two hundred fifty-three thousand, four hundred forty-five".