11661600501566 has 32 divisors (see below), whose sum is σ = 18089270347680. Its totient is φ = 5634793062400.

The previous prime is 11661600501539. The next prime is 11661600501587. The reversal of 11661600501566 is 66510500616611.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2226536 + ... + 5317956.

It is an arithmetic number, because the mean of its divisors is an integer number (565289698365).

Almost surely, 2^{11661600501566} is an apocalyptic number.

11661600501566 is a deficient number, since it is larger than the sum of its proper divisors (6427669846114).

11661600501566 is a wasteful number, since it uses less digits than its factorization.

11661600501566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091900.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 11661600501566 in words is "eleven trillion, six hundred sixty-one billion, six hundred million, five hundred one thousand, five hundred sixty-six".