159009866 has 4 divisors (see below), whose sum is σ = 238514802. Its totient is φ = 79504932.

The previous prime is 159009863. The next prime is 159009889. The reversal of 159009866 is 668900951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668900951 = 2383 ⋅280697.

It can be written as a sum of positive squares in only one way, i.e., 153388225 + 5621641 = 12385^2 + 2371^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (159009863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39752465 + ... + 39752468.

Almost surely, 2^159009866 is an apocalyptic number.

159009866 is a deficient number, since it is larger than the sum of its proper divisors (79504936).

159009866 is an equidigital number, since it uses as much as digits as its factorization.

159009866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79504935.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 159009866 is about 12609.9114191972. The cubic root of 159009866 is about 541.7613565217.

The spelling of 159009866 in words is "one hundred fifty-nine million, nine thousand, eight hundred sixty-six".