666775017760 has 96 divisors (see below), whose sum is σ = 1583744762880. Its totient is φ = 265275082752.

The previous prime is 666775017757. The next prime is 666775017781. The reversal of 666775017760 is 67710577666.

666775017760 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 666775017695 and 666775017704.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39471396 + ... + 39488284.

It is an arithmetic number, because the mean of its divisors is an integer number (16497341280).

Almost surely, 2^666775017760 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 666775017760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (791872381440).

666775017760 is an abundant number, since it is smaller than the sum of its proper divisors (916969745120).

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

666775017760 is a wasteful number, since it uses less digits than its factorization.

666775017760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18218 (or 18210 counting only the distinct ones).

The product of its (nonzero) digits is 15558480, while the sum is 58.

The spelling of 666775017760 in words is "six hundred sixty-six billion, seven hundred seventy-five million, seventeen thousand, seven hundred sixty".