78961105181 has 32 divisors (see below), whose sum is σ = 97511040000. Its totient is φ = 62405240832.

The previous prime is 78961105159. The next prime is 78961105187. The reversal of 78961105181 is 18150116987.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78961105181 is a prime.

It is a super-3 number, since 3×78961105181³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78961105187) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1120220 + ... + 1188618.

It is an arithmetic number, because the mean of its divisors is an integer number (3047220000).

Almost surely, 2^78961105181 is an apocalyptic number.

It is an amenable number.

78961105181 is a deficient number, since it is larger than the sum of its proper divisors (18549934819).

78961105181 is a wasteful number, since it uses less digits than its factorization.

78961105181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68621.

The product of its (nonzero) digits is 120960, while the sum is 47.

The spelling of 78961105181 in words is "seventy-eight billion, nine hundred sixty-one million, one hundred five thousand, one hundred eighty-one".