11561543163 has 6 divisors (see below), whose sum is σ = 16700006804. Its totient is φ = 7707695436.

The previous prime is 11561543159. The next prime is 11561543167. The reversal of 11561543163 is 36134516511.

11561543163 is a `hidden beast` number, since 1 + 1 + 5 + 615 + 4 + 31 + 6 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (11561543159) and next prime (11561543167).

It is not a de Polignac number, because 11561543163 - 2² = 11561543159 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 642307945 + ... + 642307962.

Almost surely, 2^11561543163 is an apocalyptic number.

11561543163 is a deficient number, since it is larger than the sum of its proper divisors (5138463641).

11561543163 is a wasteful number, since it uses less digits than its factorization.

11561543163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284615913 (or 1284615910 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The spelling of 11561543163 in words is "eleven billion, five hundred sixty-one million, five hundred forty-three thousand, one hundred sixty-three".