158555977 has 4 divisors (see below), whose sum is σ = 158755716. Its totient is φ = 158356240.

The previous prime is 158555939. The next prime is 158555987. The reversal of 158555977 is 779555851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 779555851 = 5623 ⋅138637.

It can be written as a sum of positive squares in 2 ways, for example, as 133194681 + 25361296 = 11541^2 + 5036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158555977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158555987) 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, 98674 + ... + 100267.

It is an arithmetic number, because the mean of its divisors is an integer number (39688929).

Almost surely, 2^158555977 is an apocalyptic number.

It is an amenable number.

158555977 is a deficient number, since it is larger than the sum of its proper divisors (199739).

158555977 is an equidigital number, since it uses as much as digits as its factorization.

158555977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199738.

The product of its digits is 2205000, while the sum is 52.

The square root of 158555977 is about 12591.9012464361. The cubic root of 158555977 is about 541.2453846321.

The spelling of 158555977 in words is "one hundred fifty-eight million, five hundred fifty-five thousand, nine hundred seventy-seven".