158187320891 has 8 divisors (see below), whose sum is σ = 167612205600. Its totient is φ = 148775741568.

The previous prime is 158187320881. The next prime is 158187320917. The reversal of 158187320891 is 198023781851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158187320891 - 2⁶ = 158187320827 is a prime.

It is a super-3 number, since 3×158187320891³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158187320861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3301856 + ... + 3349421.

It is an arithmetic number, because the mean of its divisors is an integer number (20951525700).

Almost surely, 2^158187320891 is an apocalyptic number.

158187320891 is a deficient number, since it is larger than the sum of its proper divisors (9424884709).

158187320891 is a wasteful number, since it uses less digits than its factorization.

158187320891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6652693.

The product of its (nonzero) digits is 967680, while the sum is 53.

The spelling of 158187320891 in words is "one hundred fifty-eight billion, one hundred eighty-seven million, three hundred twenty thousand, eight hundred ninety-one".