158228666 has 4 divisors (see below), whose sum is σ = 237343002. Its totient is φ = 79114332.

The previous prime is 158228657. The next prime is 158228677. The reversal of 158228666 is 666822851.

158228666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666822851 = 223 ⋅2990237.

It can be written as a sum of positive squares in only one way, i.e., 149940025 + 8288641 = 12245^2 + 2879^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39557165 + ... + 39557168.

Almost surely, 2^158228666 is an apocalyptic number.

158228666 is a deficient number, since it is larger than the sum of its proper divisors (79114336).

158228666 is an equidigital number, since it uses as much as digits as its factorization.

158228666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79114335.

The product of its digits is 276480, while the sum is 44.

The square root of 158228666 is about 12578.8976464554. The cubic root of 158228666 is about 540.8726926789.

The spelling of 158228666 in words is "one hundred fifty-eight million, two hundred twenty-eight thousand, six hundred sixty-six".