78681731181 has 16 divisors (see below), whose sum is σ = 105049155456. Its totient is φ = 52384444416.

The previous prime is 78681731119. The next prime is 78681731203. The reversal of 78681731181 is 18113718687.

It is not a de Polignac number, because 78681731181 - 2¹⁵ = 78681698413 is a prime.

It is a super-2 number, since 2×78681731181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78681731081) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10210576 + ... + 10218278.

It is an arithmetic number, because the mean of its divisors is an integer number (6565572216).

Almost surely, 2^78681731181 is an apocalyptic number.

It is an amenable number.

78681731181 is a deficient number, since it is larger than the sum of its proper divisors (26367424275).

78681731181 is a wasteful number, since it uses less digits than its factorization.

78681731181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11812.

The product of its digits is 451584, while the sum is 51.

The spelling of 78681731181 in words is "seventy-eight billion, six hundred eighty-one million, seven hundred thirty-one thousand, one hundred eighty-one".