665881070760 has 96 divisors (see below), whose sum is σ = 2244265863840. Its totient is φ = 177568282944.

The previous prime is 665881070651. The next prime is 665881070761. The reversal of 665881070760 is 67070188566.

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 = 665881070697 and 665881070706.

It is not an unprimeable number, because it can be changed into a prime (665881070761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34243422 + ... + 34262861.

It is an arithmetic number, because the mean of its divisors is an integer number (23377769415).

Almost surely, 2^665881070760 is an apocalyptic number.

665881070760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665881070760 is an abundant number, since it is smaller than the sum of its proper divisors (1578384793080).

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

665881070760 is a wasteful number, since it uses less digits than its factorization.

665881070760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68506309 (or 68506293 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 665881070760 in words is "six hundred sixty-five billion, eight hundred eighty-one million, seventy thousand, seven hundred sixty".