61443505500 has 192 divisors, whose sum is σ = 193066892928. Its totient is φ = 15094732800.

The previous prime is 61443505489. The next prime is 61443505523. The reversal of 61443505500 is 550534416.

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, 10858672 + ... + 10864328.

It is an arithmetic number, because the mean of its divisors is an integer number (1005556734).

Almost surely, 2^61443505500 is an apocalyptic number.

61443505500 is a gapful number since it is divisible by the number (60) 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 61443505500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96533446464).

61443505500 is an abundant number, since it is smaller than the sum of its proper divisors (131623387428).

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

61443505500 is a wasteful number, since it uses less digits than its factorization.

61443505500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6249 (or 6237 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 61443505500 in words is "sixty-one billion, four hundred forty-three million, five hundred five thousand, five hundred".