665281643760 has 160 divisors (see below), whose sum is σ = 2292364618560. Its totient is φ = 177343488000.

The previous prime is 665281643731. The next prime is 665281643813. The reversal of 665281643760 is 67346182566.

665281643760 is a `hidden beast` number, since 6 + 6 + 528 + 1 + 6 + 43 + 76 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 665281643697 and 665281643706.

It is a congruent number.

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, 5995180 + ... + 6105140.

It is an arithmetic number, because the mean of its divisors is an integer number (14327278866).

Almost surely, 2^665281643760 is an apocalyptic number.

665281643760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665281643760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146182309280).

665281643760 is an abundant number, since it is smaller than the sum of its proper divisors (1627082974800).

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

665281643760 is a wasteful number, since it uses less digits than its factorization.

665281643760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112784 (or 112772 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 665281643760 in words is "six hundred sixty-five billion, two hundred eighty-one million, six hundred forty-three thousand, seven hundred sixty".