1161663568 has 20 divisors (see below), whose sum is σ = 2423856148. Its totient is φ = 536152320.

The previous prime is 1161663551. The next prime is 1161663571. The reversal of 1161663568 is 8653661611.

It can be written as a sum of positive squares in 2 ways, for example, as 428986944 + 732676624 = 20712^2 + 27068^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2792253 + ... + 2792668.

Almost surely, 2^1161663568 is an apocalyptic number.

It is an amenable number.

1161663568 is an abundant number, since it is smaller than the sum of its proper divisors (1262192580).

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

1161663568 is a wasteful number, since it uses less digits than its factorization.

1161663568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5584942 (or 5584936 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 1161663568 is about 34083.1860013116. The cubic root of 1161663568 is about 1051.2196162283.

The spelling of 1161663568 in words is "one billion, one hundred sixty-one million, six hundred sixty-three thousand, five hundred sixty-eight".