78165841678 has 4 divisors (see below), whose sum is σ = 117248762520. Its totient is φ = 39082920838.

The previous prime is 78165841667. The next prime is 78165841687. The reversal of 78165841678 is 87614856187.

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

It is a super-2 number, since 2×78165841678² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19541460418 + ... + 19541460421.

It is an arithmetic number, because the mean of its divisors is an integer number (29312190630).

Almost surely, 2^78165841678 is an apocalyptic number.

78165841678 is a deficient number, since it is larger than the sum of its proper divisors (39082920842).

78165841678 is a wasteful number, since it uses less digits than its factorization.

78165841678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39082920841.

The product of its digits is 18063360, while the sum is 61.

The spelling of 78165841678 in words is "seventy-eight billion, one hundred sixty-five million, eight hundred forty-one thousand, six hundred seventy-eight".