11661651005566 has 8 divisors (see below), whose sum is σ = 17501736692160. Its totient is φ = 5827738774848.

The previous prime is 11661651005549. The next prime is 11661651005647. The reversal of 11661651005566 is 66550015616611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1543359246 + ... + 1543366801.

It is an arithmetic number, because the mean of its divisors is an integer number (2187717086520).

Almost surely, 2^{11661651005566} is an apocalyptic number.

11661651005566 is a deficient number, since it is larger than the sum of its proper divisors (5840085686594).

11661651005566 is a wasteful number, since it uses less digits than its factorization.

11661651005566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086727938.

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 11661651005566 in words is "eleven trillion, six hundred sixty-one billion, six hundred fifty-one million, five thousand, five hundred sixty-six".