11561543164 has 6 divisors (see below), whose sum is σ = 20232700544. Its totient is φ = 5780771580.

The previous prime is 11561543159. The next prime is 11561543167. The reversal of 11561543164 is 46134516511.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561543167) by changing a digit.

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 as a sum of consecutive naturals, namely, 1445192892 + ... + 1445192899.

Almost surely, 2^11561543164 is an apocalyptic number.

It is an amenable number.

11561543164 is a deficient number, since it is larger than the sum of its proper divisors (8671157380).

11561543164 is a wasteful number, since it uses less digits than its factorization.

11561543164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2890385795 (or 2890385793 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The spelling of 11561543164 in words is "eleven billion, five hundred sixty-one million, five hundred forty-three thousand, one hundred sixty-four".