5661766128 has 80 divisors (see below), whose sum is σ = 14930044416. Its totient is φ = 1848188160.

The previous prime is 5661766111. The next prime is 5661766133. The reversal of 5661766128 is 8216671665.

It is a super-2 number, since 2×5661766128² = 64111191376336224768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1603501 + ... + 1607027.

Almost surely, 2^5661766128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5661766128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7465022208).

5661766128 is an abundant number, since it is smaller than the sum of its proper divisors (9268278288).

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

5661766128 is a wasteful number, since it uses less digits than its factorization.

5661766128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4222 (or 4216 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The square root of 5661766128 is about 75244.7083056344. The cubic root of 5661766128 is about 1782.3130020138.

The spelling of 5661766128 in words is "five billion, six hundred sixty-one million, seven hundred sixty-six thousand, one hundred twenty-eight".