11661556166550 has 96 divisors (see below), whose sum is σ = 34024305117600. Its totient is φ = 2926821934080.

The previous prime is 11661556166527. The next prime is 11661556166569. The reversal of 11661556166550 is 5566165516611.

11661556166550 is a `hidden beast` number, since 1 + 1 + 6 + 6 + 15 + 5 + 616 + 6 + 5 + 5 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 254041455 + ... + 254087354.

It is an arithmetic number, because the mean of its divisors is an integer number (354419844975).

Almost surely, 2^{11661556166550} is an apocalyptic number.

11661556166550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11661556166550 is an abundant number, since it is smaller than the sum of its proper divisors (22362748951050).

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

11661556166550 is a wasteful number, since it uses less digits than its factorization.

11661556166550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508128847 (or 508128836 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 54.

The spelling of 11661556166550 in words is "eleven trillion, six hundred sixty-one billion, five hundred fifty-six million, one hundred sixty-six thousand, five hundred fifty".