158728728491 has 4 divisors (see below), whose sum is σ = 158729837112. Its totient is φ = 158727619872.

The previous prime is 158728728461. The next prime is 158728728539. The reversal of 158728728491 is 194827827851.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 194827827851 = 47 ⋅4145272933.

It is a cyclic number.

It is not a de Polignac number, because 158728728491 - 2¹⁰ = 158728727467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158728728401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300941 + ... + 638766.

It is an arithmetic number, because the mean of its divisors is an integer number (39682459278).

Almost surely, 2^158728728491 is an apocalyptic number.

158728728491 is a deficient number, since it is larger than the sum of its proper divisors (1108621).

158728728491 is an equidigital number, since it uses as much as digits as its factorization.

158728728491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108620.

The product of its digits is 18063360, while the sum is 62.

The spelling of 158728728491 in words is "one hundred fifty-eight billion, seven hundred twenty-eight million, seven hundred twenty-eight thousand, four hundred ninety-one".