158791061520 has 720 divisors, whose sum is σ = 676187471232. Its totient is φ = 32678830080.

The previous prime is 158791061501. The next prime is 158791061537. The reversal of 158791061520 is 25160197851.

158791061520 is a `hidden beast` number, since 1 + 5 + 8 + 7 + 9 + 1 + 0 + 615 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 34919887 + ... + 34924433.

Almost surely, 2^158791061520 is an apocalyptic number.

158791061520 is a gapful number since it is divisible by the number (10) 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 158791061520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338093735616).

158791061520 is an abundant number, since it is smaller than the sum of its proper divisors (517396409712).

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

158791061520 is a wasteful number, since it uses less digits than its factorization.

158791061520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4640 (or 4618 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 45.

The spelling of 158791061520 in words is "one hundred fifty-eight billion, seven hundred ninety-one million, sixty-one thousand, five hundred twenty".