66650702179 has 4 divisors (see below), whose sum is σ = 66714240600. Its totient is φ = 66587163760.

The previous prime is 66650702171. The next prime is 66650702189. The reversal of 66650702179 is 97120705666.

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 66650702179 - 2³ = 66650702171 is a prime.

It is a super-2 number, since 2×66650702179² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66650702171) 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, 31767637 + ... + 31769734.

It is an arithmetic number, because the mean of its divisors is an integer number (16678560150).

Almost surely, 2^66650702179 is an apocalyptic number.

66650702179 is a deficient number, since it is larger than the sum of its proper divisors (63538421).

66650702179 is a wasteful number, since it uses less digits than its factorization.

66650702179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63538420.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 66650702179 in words is "sixty-six billion, six hundred fifty million, seven hundred two thousand, one hundred seventy-nine".