165210143035666 has 4 divisors (see below), whose sum is σ = 247815214553502. Its totient is φ = 82605071517832.

The previous prime is 165210143035601. The next prime is 165210143035687. The reversal of 165210143035666 is 666530341012561.

165210143035666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 148584422209441 + 16625720826225 = 12189521^2 + 4077465^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41302535758915 + ... + 41302535758918.

Almost surely, 2^{165210143035666} is an apocalyptic number.

165210143035666 is a deficient number, since it is larger than the sum of its proper divisors (82605071517836).

165210143035666 is an equidigital number, since it uses as much as digits as its factorization.

165210143035666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82605071517835.

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 165210143035666 in words is "one hundred sixty-five trillion, two hundred ten billion, one hundred forty-three million, thirty-five thousand, six hundred sixty-six".