66490307 has 4 divisors (see below), whose sum is σ = 71604960. Its totient is φ = 61375656.

The previous prime is 66490261. The next prime is 66490321. The reversal of 66490307 is 70309466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66490307 - 2¹⁴ = 66473923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66490337) 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 3 ways as a sum of consecutive naturals, for example, 2557307 + ... + 2557332.

It is an arithmetic number, because the mean of its divisors is an integer number (17901240).

Almost surely, 2^66490307 is an apocalyptic number.

66490307 is a deficient number, since it is larger than the sum of its proper divisors (5114653).

66490307 is a wasteful number, since it uses less digits than its factorization.

66490307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5114652.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 66490307 is about 8154.1588775299. The cubic root of 66490307 is about 405.1222655800.

The spelling of 66490307 in words is "sixty-six million, four hundred ninety thousand, three hundred seven".