1666105510566 has 64 divisors (see below), whose sum is σ = 4046139371520. Its totient is φ = 446761176480.

The previous prime is 1666105510549. The next prime is 1666105510591. The reversal of 1666105510566 is 6650155016661.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 9670930 + ... + 9841701.

It is an arithmetic number, because the mean of its divisors is an integer number (63220927680).

Almost surely, 2^{1666105510566} is an apocalyptic number.

1666105510566 is an abundant number, since it is smaller than the sum of its proper divisors (2380033860954).

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

1666105510566 is a wasteful number, since it uses less digits than its factorization.

1666105510566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19512769.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 1666105510566 in words is "one trillion, six hundred sixty-six billion, one hundred five million, five hundred ten thousand, five hundred sixty-six".