661963367324 has 72 divisors (see below), whose sum is σ = 1354015067328. Its totient is φ = 282342896640.

The previous prime is 661963367269. The next prime is 661963367399. The reversal of 661963367324 is 423763369166.

It is a self number, because there is not a number n which added to its sum of digits gives 661963367324.

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 23 ways as a sum of consecutive naturals, for example, 97444472 + ... + 97451264.

It is an arithmetic number, because the mean of its divisors is an integer number (18805764824).

Almost surely, 2^661963367324 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 661963367324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (677007533664).

661963367324 is an abundant number, since it is smaller than the sum of its proper divisors (692051700004).

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

661963367324 is a wasteful number, since it uses less digits than its factorization.

661963367324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9115 (or 9106 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 56.

The spelling of 661963367324 in words is "six hundred sixty-one billion, nine hundred sixty-three million, three hundred sixty-seven thousand, three hundred twenty-four".