78647301666 has 24 divisors (see below), whose sum is σ = 170446886064. Its totient is φ = 26208936600.

The previous prime is 78647301643. The next prime is 78647301701. The reversal of 78647301666 is 66610374687.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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 11 ways as a sum of consecutive naturals, for example, 497976 + ... + 636611.

It is an arithmetic number, because the mean of its divisors is an integer number (7101953586).

Almost surely, 2^78647301666 is an apocalyptic number.

78647301666 is an abundant number, since it is smaller than the sum of its proper divisors (91799584398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78647301666 is a wasteful number, since it uses less digits than its factorization.

78647301666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138446 (or 1138443 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 54.

The spelling of 78647301666 in words is "seventy-eight billion, six hundred forty-seven million, three hundred one thousand, six hundred sixty-six".