158318477818 has 4 divisors (see below), whose sum is σ = 237477716730. Its totient is φ = 79159238908.

The previous prime is 158318477809. The next prime is 158318477819. The reversal of 158318477818 is 818774813851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 82801789009 + 75516688809 = 287753^2 + 274803^2 .

It is a super-2 number, since 2×158318477818² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (158318477819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39579619453 + ... + 39579619456.

Almost surely, 2^158318477818 is an apocalyptic number.

158318477818 is a deficient number, since it is larger than the sum of its proper divisors (79159238912).

158318477818 is an equidigital number, since it uses as much as digits as its factorization.

158318477818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79159238911.

The product of its digits is 12042240, while the sum is 61.

The spelling of 158318477818 in words is "one hundred fifty-eight billion, three hundred eighteen million, four hundred seventy-seven thousand, eight hundred eighteen".