78651917178 has 16 divisors (see below), whose sum is σ = 159970001760. Its totient is φ = 25772944496.

The previous prime is 78651917173. The next prime is 78651917207. The reversal of 78651917178 is 87171915687.

It is a super-2 number, since 2×78651917178² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78651917173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111089925 + ... + 111090632.

It is an arithmetic number, because the mean of its divisors is an integer number (9998125110).

Almost surely, 2^78651917178 is an apocalyptic number.

78651917178 is an abundant number, since it is smaller than the sum of its proper divisors (81318084582).

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

78651917178 is a wasteful number, since it uses less digits than its factorization.

78651917178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222180621.

The product of its digits is 5927040, while the sum is 60.

The spelling of 78651917178 in words is "seventy-eight billion, six hundred fifty-one million, nine hundred seventeen thousand, one hundred seventy-eight".