660642786500 has 96 divisors (see below), whose sum is σ = 1479289803264. Its totient is φ = 257625907200.

The previous prime is 660642786481. The next prime is 660642786521. The reversal of 660642786500 is 5687246066.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5984807 + ... + 6094193.

It is an arithmetic number, because the mean of its divisors is an integer number (15409268784).

Almost surely, 2^660642786500 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 660642786500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (739644901632).

660642786500 is an abundant number, since it is smaller than the sum of its proper divisors (818647016764).

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

660642786500 is a wasteful number, since it uses less digits than its factorization.

660642786500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109710 (or 109698 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 660642786500 in words is "six hundred sixty billion, six hundred forty-two million, seven hundred eighty-six thousand, five hundred".