79747666 has 4 divisors (see below), whose sum is σ = 119621502. Its totient is φ = 39873832.

The previous prime is 79747643. The next prime is 79747721. The reversal of 79747666 is 66674797.

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

It can be written as a sum of positive squares in only one way, i.e., 52925625 + 26822041 = 7275^2 + 5179^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19936915 + ... + 19936918.

Almost surely, 2^79747666 is an apocalyptic number.

79747666 is a deficient number, since it is larger than the sum of its proper divisors (39873836).

79747666 is a wasteful number, since it uses less digits than its factorization.

79747666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39873835.

The product of its digits is 2667168, while the sum is 52.

The square root of 79747666 is about 8930.1548698777. The cubic root of 79747666 is about 430.4334299211.

The spelling of 79747666 in words is "seventy-nine million, seven hundred forty-seven thousand, six hundred sixty-six".