158661003 has 4 divisors (see below), whose sum is σ = 211548008. Its totient is φ = 105774000.

The previous prime is 158660981. The next prime is 158661023. The reversal of 158661003 is 300166851.

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

It is not a de Polignac number, because 158661003 - 2¹⁰ = 158659979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158661023) 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, 26443498 + ... + 26443503.

It is an arithmetic number, because the mean of its divisors is an integer number (52887002).

Almost surely, 2^158661003 is an apocalyptic number.

158661003 is a deficient number, since it is larger than the sum of its proper divisors (52887005).

158661003 is an equidigital number, since it uses as much as digits as its factorization.

158661003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52887004.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 158661003 is about 12596.0709350178. The cubic root of 158661003 is about 541.3648635532.

The spelling of 158661003 in words is "one hundred fifty-eight million, six hundred sixty-one thousand, three".