158981099868 has 360 divisors, whose sum is σ = 461312248320. Its totient is φ = 47673722880.

The previous prime is 158981099857. The next prime is 158981099869. The reversal of 158981099868 is 868990189851.

It is a junction number, because it is equal to n+sod(n) for n = 158981099796 and 158981099805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158981099869) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 344861158 + ... + 344861618.

It is an arithmetic number, because the mean of its divisors is an integer number (1281422912).

Almost surely, 2^158981099868 is an apocalyptic number.

158981099868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158981099868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230656124160).

158981099868 is an abundant number, since it is smaller than the sum of its proper divisors (302331148452).

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

158981099868 is a wasteful number, since it uses less digits than its factorization.

158981099868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 72.

The spelling of 158981099868 in words is "one hundred fifty-eight billion, nine hundred eighty-one million, ninety-nine thousand, eight hundred sixty-eight".