66306493 has 16 divisors (see below), whose sum is σ = 76070016. Its totient is φ = 57207040.

The previous prime is 66306481. The next prime is 66306497. The reversal of 66306493 is 39460366.

It is not a de Polignac number, because 66306493 - 2²⁵ = 32752061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66306497) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 33705 + ... + 35617.

It is an arithmetic number, because the mean of its divisors is an integer number (4754376).

Almost surely, 2^66306493 is an apocalyptic number.

It is an amenable number.

66306493 is a deficient number, since it is larger than the sum of its proper divisors (9763523).

66306493 is a wasteful number, since it uses less digits than its factorization.

66306493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084.

The product of its (nonzero) digits is 69984, while the sum is 37.

The square root of 66306493 is about 8142.8798959582. The cubic root of 66306493 is about 404.7485977221.

The spelling of 66306493 in words is "sixty-six million, three hundred six thousand, four hundred ninety-three".