661655324000 has 384 divisors, whose sum is σ = 1799359930368. Its totient is φ = 237120000000.

The previous prime is 661655323981. The next prime is 661655324027. The reversal of 661655324000 is 423556166.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1100923700 + ... + 1100924300.

It is an arithmetic number, because the mean of its divisors is an integer number (4685833152).

Almost surely, 2^661655324000 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 661655324000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899679965184).

661655324000 is an abundant number, since it is smaller than the sum of its proper divisors (1137704606368).

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

661655324000 is a wasteful number, since it uses less digits than its factorization.

661655324000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959 (or 941 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 661655324000 in words is "six hundred sixty-one billion, six hundred fifty-five million, three hundred twenty-four thousand".