166565250665 has 16 divisors (see below), whose sum is σ = 218961411840. Its totient is φ = 120631499520.

The previous prime is 166565250583. The next prime is 166565250673. The reversal of 166565250665 is 566052565661.

It is not a de Polignac number, because 166565250665 - 2¹² = 166565246569 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 6322544 + ... + 6348833.

It is an arithmetic number, because the mean of its divisors is an integer number (13685088240).

Almost surely, 2^166565250665 is an apocalyptic number.

It is an amenable number.

166565250665 is a deficient number, since it is larger than the sum of its proper divisors (52396161175).

166565250665 is a wasteful number, since it uses less digits than its factorization.

166565250665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12671632.

The product of its (nonzero) digits is 9720000, while the sum is 53.

The spelling of 166565250665 in words is "one hundred sixty-six billion, five hundred sixty-five million, two hundred fifty thousand, six hundred sixty-five".