11661554554 has 32 divisors (see below), whose sum is σ = 19251219456. Its totient is φ = 5264313600.

The previous prime is 11661554533. The next prime is 11661554573. The reversal of 11661554554 is 45545516611.

It is a self number, because there is not a number n which added to its sum of digits gives 11661554554.

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 15 ways as a sum of consecutive naturals, for example, 3421119 + ... + 3424525.

It is an arithmetic number, because the mean of its divisors is an integer number (601600608).

Almost surely, 2^11661554554 is an apocalyptic number.

11661554554 is a deficient number, since it is larger than the sum of its proper divisors (7589664902).

11661554554 is a wasteful number, since it uses less digits than its factorization.

11661554554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6270.

The product of its digits is 360000, while the sum is 43.

The spelling of 11661554554 in words is "eleven billion, six hundred sixty-one million, five hundred fifty-four thousand, five hundred fifty-four".