661833743600 has 120 divisors (see below), whose sum is σ = 1645759581312. Its totient is φ = 255505075200.

The previous prime is 661833743581. The next prime is 661833743609. The reversal of 661833743600 is 6347338166.

661833743600 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661833743609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4553654 + ... + 4696746.

Almost surely, 2^661833743600 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 661833743600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822879790656).

661833743600 is an abundant number, since it is smaller than the sum of its proper divisors (983925837712).

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

661833743600 is a wasteful number, since it uses less digits than its factorization.

661833743600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143515 (or 143504 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 47.

The spelling of 661833743600 in words is "six hundred sixty-one billion, eight hundred thirty-three million, seven hundred forty-three thousand, six hundred".