5661540500 has 192 divisors, whose sum is σ = 15498362880. Its totient is φ = 1755216000.

The previous prime is 5661540491. The next prime is 5661540527. The reversal of 5661540500 is 50451665.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11819261 + ... + 11819739.

It is an arithmetic number, because the mean of its divisors is an integer number (80720640).

Almost surely, 2^5661540500 is an apocalyptic number.

5661540500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5661540500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7749181440).

5661540500 is an abundant number, since it is smaller than the sum of its proper divisors (9836822380).

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

5661540500 is a wasteful number, since it uses less digits than its factorization.

5661540500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823 (or 811 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 5661540500 is about 75243.2089958954. The cubic root of 5661540500 is about 1782.2893259469.

The spelling of 5661540500 in words is "five billion, six hundred sixty-one million, five hundred forty thousand, five hundred".