5661988568 has 24 divisors (see below), whose sum is σ = 11097880500. Its totient is φ = 2707905552.

The previous prime is 5661988547. The next prime is 5661988573. The reversal of 5661988568 is 8658891665.

It is a super-2 number, since 2×5661988568² = 64116229088325381248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5661988568.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 664718 + ... + 673181.

Almost surely, 2^5661988568 is an apocalyptic number.

It is an amenable number.

5661988568 is a deficient number, since it is larger than the sum of its proper divisors (5435891932).

5661988568 is a wasteful number, since it uses less digits than its factorization.

5661988568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337951 (or 1337924 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 62.

The square root of 5661988568 is about 75246.1864017041. The cubic root of 5661988568 is about 1782.3363429350.

The spelling of 5661988568 in words is "five billion, six hundred sixty-one million, nine hundred eighty-eight thousand, five hundred sixty-eight".