79788070666 has 4 divisors (see below), whose sum is σ = 119682106002. Its totient is φ = 39894035332.

The previous prime is 79788070651. The next prime is 79788070693. The reversal of 79788070666 is 66607088797.

It is a happy number.

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., 74898005625 + 4890065041 = 273675^2 + 69929^2 .

It is a super-2 number, since 2×79788070666² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 79788070598 and 79788070607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19947017665 + ... + 19947017668.

Almost surely, 2^79788070666 is an apocalyptic number.

79788070666 is a deficient number, since it is larger than the sum of its proper divisors (39894035336).

79788070666 is a wasteful number, since it uses less digits than its factorization.

79788070666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39894035335.

The product of its (nonzero) digits is 42674688, while the sum is 64.

The spelling of 79788070666 in words is "seventy-nine billion, seven hundred eighty-eight million, seventy thousand, six hundred sixty-six".