158742985805 has 4 divisors (see below), whose sum is σ = 190491582972. Its totient is φ = 126994388640.

The previous prime is 158742985789. The next prime is 158742985861. The reversal of 158742985805 is 508589247851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508589247851 = 4127 ⋅123234613.

It can be written as a sum of positive squares in 2 ways, for example, as 60907278436 + 97835707369 = 246794^2 + 312787^2 .

It is not a de Polignac number, because 158742985805 - 2⁴ = 158742985789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15874298576 + ... + 15874298585.

It is an arithmetic number, because the mean of its divisors is an integer number (47622895743).

Almost surely, 2^158742985805 is an apocalyptic number.

It is an amenable number.

158742985805 is a deficient number, since it is larger than the sum of its proper divisors (31748597167).

158742985805 is an equidigital number, since it uses as much as digits as its factorization.

158742985805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31748597166.

The product of its (nonzero) digits is 32256000, while the sum is 62.

The spelling of 158742985805 in words is "one hundred fifty-eight billion, seven hundred forty-two million, nine hundred eighty-five thousand, eight hundred five".