78650873666 has 8 divisors (see below), whose sum is σ = 118154794044. Its totient is φ = 39265942320.

The previous prime is 78650873659. The next prime is 78650873671. The reversal of 78650873666 is 66637805687.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 65290981441 + 13359892225 = 255521^2 + 115585^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 78650873599 and 78650873608.

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 in 3 ways as a sum of consecutive naturals, for example, 29745605 + ... + 29748248.

Almost surely, 2^78650873666 is an apocalyptic number.

78650873666 is a deficient number, since it is larger than the sum of its proper divisors (39503920378).

78650873666 is a wasteful number, since it uses less digits than its factorization.

78650873666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59494516.

The product of its (nonzero) digits is 60963840, while the sum is 62.

The spelling of 78650873666 in words is "seventy-eight billion, six hundred fifty million, eight hundred seventy-three thousand, six hundred sixty-six".