66499673 has 4 divisors (see below), whose sum is σ = 66619620. Its totient is φ = 66379728.

The previous prime is 66499651. The next prime is 66499687. The reversal of 66499673 is 37699466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15976009 + 50523664 = 3997^2 + 7108^2 .

It is a cyclic number.

It is not a de Polignac number, because 66499673 - 2¹⁸ = 66237529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66499633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59138 + ... + 60251.

It is an arithmetic number, because the mean of its divisors is an integer number (16654905).

Almost surely, 2^66499673 is an apocalyptic number.

It is an amenable number.

66499673 is a deficient number, since it is larger than the sum of its proper divisors (119947).

66499673 is a wasteful number, since it uses less digits than its factorization.

66499673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119946.

The product of its digits is 1469664, while the sum is 50.

The square root of 66499673 is about 8154.7331654690. The cubic root of 66499673 is about 405.1412868838.

The spelling of 66499673 in words is "sixty-six million, four hundred ninety-nine thousand, six hundred seventy-three".