660661404192 has 240 divisors, whose sum is σ = 1963677786840. Its totient is φ = 217886257152.

The previous prime is 660661404181. The next prime is 660661404211. The reversal of 660661404192 is 291404166066.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 283070817936 + 377590586256 = 532044^2 + 614484^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 112565034 + ... + 112570902.

Almost surely, 2^660661404192 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 660661404192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (981838893420).

660661404192 is an abundant number, since it is smaller than the sum of its proper divisors (1303016382648).

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

660661404192 is a wasteful number, since it uses less digits than its factorization.

660661404192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6345 (or 6328 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 660661404192 in words is "six hundred sixty billion, six hundred sixty-one million, four hundred four thousand, one hundred ninety-two".