66253405 has 8 divisors (see below), whose sum is σ = 79547832. Its totient is φ = 52973568.

The previous prime is 66253393. The next prime is 66253423. The reversal of 66253405 is 50435266.

It can be written as a sum of positive squares in 4 ways, for example, as 1708249 + 64545156 = 1307^2 + 8034^2 .

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 66253405 - 2¹¹ = 66251357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15369 + ... + 19201.

It is an arithmetic number, because the mean of its divisors is an integer number (9943479).

Almost surely, 2^66253405 is an apocalyptic number.

It is an amenable number.

66253405 is a deficient number, since it is larger than the sum of its proper divisors (13294427).

66253405 is a wasteful number, since it uses less digits than its factorization.

66253405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7295.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 66253405 is about 8139.6194628496. The cubic root of 66253405 is about 404.6405488232.

The spelling of 66253405 in words is "sixty-six million, two hundred fifty-three thousand, four hundred five".