660009681792 has 192 divisors, whose sum is σ = 1937819052000. Its totient is φ = 215546892288.

The previous prime is 660009681767. The next prime is 660009681811. The reversal of 660009681792 is 297186900066.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×660009681792² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45357334 + ... + 45371882.

Almost surely, 2^660009681792 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 660009681792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (968909526000).

660009681792 is an abundant number, since it is smaller than the sum of its proper divisors (1277809370208).

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

660009681792 is a wasteful number, since it uses less digits than its factorization.

660009681792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15365 (or 15350 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 660009681792 in words is "six hundred sixty billion, nine million, six hundred eighty-one thousand, seven hundred ninety-two".