158817861 has 8 divisors (see below), whose sum is σ = 235285760. Its totient is φ = 105878556.

The previous prime is 158817823. The next prime is 158817871. The reversal of 158817861 is 168718851.

158817861 is a `hidden beast` number, since 1 + 588 + 1 + 7 + 8 + 61 = 666.

It is not a de Polignac number, because 158817861 - 2¹³ = 158809669 is a prime.

It is a super-2 number, since 2×158817861² = 50446225945230642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158817811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2941045 + ... + 2941098.

It is an arithmetic number, because the mean of its divisors is an integer number (29410720).

Almost surely, 2^158817861 is an apocalyptic number.

It is an amenable number.

158817861 is a deficient number, since it is larger than the sum of its proper divisors (76467899).

158817861 is an equidigital number, since it uses as much as digits as its factorization.

158817861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5882152 (or 5882146 counting only the distinct ones).

The product of its digits is 107520, while the sum is 45.

The square root of 158817861 is about 12602.2958622626. The cubic root of 158817861 is about 541.5432090811.

The spelling of 158817861 in words is "one hundred fifty-eight million, eight hundred seventeen thousand, eight hundred sixty-one".