78961105158 has 64 divisors (see below), whose sum is σ = 173802101760. Its totient is φ = 23763255552.

The previous prime is 78961105087. The next prime is 78961105159. The reversal of 78961105158 is 85150116987.

It is a super-3 number, since 3×78961105158³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 78961105158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78961105159) 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, 6398338 + ... + 6410666.

It is an arithmetic number, because the mean of its divisors is an integer number (2715657840).

Almost surely, 2^78961105158 is an apocalyptic number.

78961105158 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78961105158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86901050880).

78961105158 is an abundant number, since it is smaller than the sum of its proper divisors (94840996602).

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

78961105158 is a wasteful number, since it uses less digits than its factorization.

78961105158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14141.

The product of its (nonzero) digits is 604800, while the sum is 51.

The spelling of 78961105158 in words is "seventy-eight billion, nine hundred sixty-one million, one hundred five thousand, one hundred fifty-eight".