158861705 has 4 divisors (see below), whose sum is σ = 190634052. Its totient is φ = 127089360.

The previous prime is 158861693. The next prime is 158861711. The reversal of 158861705 is 507168851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507168851 = 7 ⋅72452693.

It can be written as a sum of positive squares in 2 ways, for example, as 25482304 + 133379401 = 5048^2 + 11549^2 .

It is not a de Polignac number, because 158861705 - 2¹⁴ = 158845321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15886166 + ... + 15886175.

It is an arithmetic number, because the mean of its divisors is an integer number (47658513).

Almost surely, 2^158861705 is an apocalyptic number.

It is an amenable number.

158861705 is a deficient number, since it is larger than the sum of its proper divisors (31772347).

158861705 is an equidigital number, since it uses as much as digits as its factorization.

158861705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31772346.

The product of its (nonzero) digits is 67200, while the sum is 41.

The square root of 158861705 is about 12604.0352665327. The cubic root of 158861705 is about 541.5930381447.

The spelling of 158861705 in words is "one hundred fifty-eight million, eight hundred sixty-one thousand, seven hundred five".