158440669 has 2 divisors, whose sum is σ = 158440670. Its totient is φ = 158440668.

The previous prime is 158440661. The next prime is 158440801. The reversal of 158440669 is 966044851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158432569 + 8100 = 12587^2 + 90^2 .

It is an emirp because it is prime and its reverse (966044851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158440669 - 2³ = 158440661 is a prime.

It is a super-2 number, since 2×158440669² = 50206891186335122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158440661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79220334 + 79220335.

It is an arithmetic number, because the mean of its divisors is an integer number (79220335).

Almost surely, 2^158440669 is an apocalyptic number.

It is an amenable number.

158440669 is a deficient number, since it is larger than the sum of its proper divisors (1).

158440669 is an equidigital number, since it uses as much as digits as its factorization.

158440669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 158440669 is about 12587.3217564341. The cubic root of 158440669 is about 541.1141479987.

The spelling of 158440669 in words is "one hundred fifty-eight million, four hundred forty thousand, six hundred sixty-nine".