159905506666 has 8 divisors (see below), whose sum is σ = 242331025860. Its totient is φ = 79128498048.

The previous prime is 159905506603. The next prime is 159905506679. The reversal of 159905506666 is 666605509951.

159905506666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 144061998025 + 15843508641 = 379555^2 + 125871^2 .

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

It is a super-2 number, since 2×159905506666² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 159905506666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412127401 + ... + 412127788.

Almost surely, 2^159905506666 is an apocalyptic number.

159905506666 is a deficient number, since it is larger than the sum of its proper divisors (82425519194).

159905506666 is an equidigital number, since it uses as much as digits as its factorization.

159905506666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824255288.

The product of its (nonzero) digits is 13122000, while the sum is 58.

The spelling of 159905506666 in words is "one hundred fifty-nine billion, nine hundred five million, five hundred six thousand, six hundred sixty-six".