66451306 has 8 divisors (see below), whose sum is σ = 99894564. Its totient is φ = 33153120.

The previous prime is 66451291. The next prime is 66451309. The reversal of 66451306 is 60315466.

It can be written as a sum of positive squares in 2 ways, for example, as 63920025 + 2531281 = 7995^2 + 1591^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66451309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35115 + ... + 36958.

Almost surely, 2^66451306 is an apocalyptic number.

66451306 is a deficient number, since it is larger than the sum of its proper divisors (33443258).

66451306 is a wasteful number, since it uses less digits than its factorization.

66451306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72536.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 66451306 is about 8151.7670477020. The cubic root of 66451306 is about 405.0430396774.

The spelling of 66451306 in words is "sixty-six million, four hundred fifty-one thousand, three hundred six".