158666665 has 8 divisors (see below), whose sum is σ = 190467648. Its totient is φ = 126888240.

The previous prime is 158666647. The next prime is 158666699. The reversal of 158666665 is 566666851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 158666665 - 2²⁵ = 125112233 is a prime.

It is a super-2 number, since 2×158666665² = 50350221164444450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24234 + ... + 30076.

It is an arithmetic number, because the mean of its divisors is an integer number (23808456).

Almost surely, 2^158666665 is an apocalyptic number.

It is an amenable number.

158666665 is a deficient number, since it is larger than the sum of its proper divisors (31800983).

158666665 is an equidigital number, since it uses as much as digits as its factorization.

158666665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11279.

The product of its digits is 1555200, while the sum is 49.

The square root of 158666665 is about 12596.2956856371. The cubic root of 158666665 is about 541.3713032188.

The spelling of 158666665 in words is "one hundred fifty-eight million, six hundred sixty-six thousand, six hundred sixty-five".