158157791491 has 16 divisors (see below), whose sum is σ = 198537408000. Its totient is φ = 122845016448.

The previous prime is 158157791461. The next prime is 158157791549. The reversal of 158157791491 is 194197751851.

It is not a de Polignac number, because 158157791491 - 2⁹ = 158157790979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158157791461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25848166 + ... + 25854283.

It is an arithmetic number, because the mean of its divisors is an integer number (12408588000).

Almost surely, 2^158157791491 is an apocalyptic number.

158157791491 is a deficient number, since it is larger than the sum of its proper divisors (40379616509).

158157791491 is a wasteful number, since it uses less digits than its factorization.

158157791491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51702498.

The product of its digits is 3175200, while the sum is 58.

The spelling of 158157791491 in words is "one hundred fifty-eight billion, one hundred fifty-seven million, seven hundred ninety-one thousand, four hundred ninety-one".