66451305 has 32 divisors (see below), whose sum is σ = 108662400. Its totient is φ = 34670592.

The previous prime is 66451291. The next prime is 66451309. The reversal of 66451305 is 50315466.

It is not a de Polignac number, because 66451305 - 2⁴ = 66451289 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 158386 + ... + 158804.

It is an arithmetic number, because the mean of its divisors is an integer number (3395700).

Almost surely, 2^66451305 is an apocalyptic number.

It is an amenable number.

66451305 is a deficient number, since it is larger than the sum of its proper divisors (42211095).

66451305 is a wasteful number, since it uses less digits than its factorization.

66451305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66451305 is about 8151.7669863656. The cubic root of 66451305 is about 405.0430376456.

The spelling of 66451305 in words is "sixty-six million, four hundred fifty-one thousand, three hundred five".