158661418 has 4 divisors (see below), whose sum is σ = 237992130. Its totient is φ = 79330708.

The previous prime is 158661409. The next prime is 158661421. The reversal of 158661418 is 814166851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 814166851 = 29 ⋅28074719.

It can be written as a sum of positive squares in only one way, i.e., 82500889 + 76160529 = 9083^2 + 8727^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39665353 + ... + 39665356.

Almost surely, 2^158661418 is an apocalyptic number.

158661418 is a deficient number, since it is larger than the sum of its proper divisors (79330712).

158661418 is an equidigital number, since it uses as much as digits as its factorization.

158661418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79330711.

The product of its digits is 46080, while the sum is 40.

The square root of 158661418 is about 12596.0874083979. The cubic root of 158661418 is about 541.3653355580.

The spelling of 158661418 in words is "one hundred fifty-eight million, six hundred sixty-one thousand, four hundred eighteen".