101660665566 has 16 divisors (see below), whose sum is σ = 203339199744. Its totient is φ = 33883910424.

The previous prime is 101660665549. The next prime is 101660665571. The reversal of 101660665566 is 665566066101.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 669990 + ... + 807593.

It is an arithmetic number, because the mean of its divisors is an integer number (12708699984).

Almost surely, 2^101660665566 is an apocalyptic number.

101660665566 is an abundant number, since it is smaller than the sum of its proper divisors (101678534178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101660665566 is a wasteful number, since it uses less digits than its factorization.

101660665566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489055.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 101660665566 in words is "one hundred one billion, six hundred sixty million, six hundred sixty-five thousand, five hundred sixty-six".