159521666 has 8 divisors (see below), whose sum is σ = 244373760. Its totient is φ = 78063748.

The previous prime is 159521657. The next prime is 159521669. The reversal of 159521666 is 666125951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (159521669) 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, 848426 + ... + 848613.

It is an arithmetic number, because the mean of its divisors is an integer number (30546720).

Almost surely, 2^159521666 is an apocalyptic number.

159521666 is a deficient number, since it is larger than the sum of its proper divisors (84852094).

159521666 is a wasteful number, since it uses less digits than its factorization.

159521666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697088.

The product of its digits is 97200, while the sum is 41.

The square root of 159521666 is about 12630.1886763421. The cubic root of 159521666 is about 542.3419840351.

The spelling of 159521666 in words is "one hundred fifty-nine million, five hundred twenty-one thousand, six hundred sixty-six".