5661211500 has 480 divisors, whose sum is σ = 22240458240. Its totient is φ = 1224720000.

The previous prime is 5661211447. The next prime is 5661211547. The reversal of 5661211500 is 51121665.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 5385975 + ... + 5387025.

It is an arithmetic number, because the mean of its divisors is an integer number (46334288).

Almost surely, 2^5661211500 is an apocalyptic number.

5661211500 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 5661211500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11120229120).

5661211500 is an abundant number, since it is smaller than the sum of its proper divisors (16579246740).

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

5661211500 is a wasteful number, since it uses less digits than its factorization.

5661211500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108 (or 1087 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 5661211500 is about 75241.0227203219. The cubic root of 5661211500 is about 1782.2548015069.

The spelling of 5661211500 in words is "five billion, six hundred sixty-one million, two hundred eleven thousand, five hundred".