66451730 has 16 divisors (see below), whose sum is σ = 120476160. Its totient is φ = 26388912.

The previous prime is 66451717. The next prime is 66451733. The reversal of 66451730 is 3715466.

It is not an unprimeable number, because it can be changed into a prime (66451733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22514 + ... + 25293.

It is an arithmetic number, because the mean of its divisors is an integer number (7529760).

Almost surely, 2^66451730 is an apocalyptic number.

66451730 is a deficient number, since it is larger than the sum of its proper divisors (54024430).

66451730 is a wasteful number, since it uses less digits than its factorization.

66451730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47953.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66451730 is about 8151.7930542918. The cubic root of 66451730 is about 405.0439011497.

The spelling of 66451730 in words is "sixty-six million, four hundred fifty-one thousand, seven hundred thirty".