665668760 has 32 divisors (see below), whose sum is σ = 1562876640. Its totient is φ = 254690304.

The previous prime is 665668753. The next prime is 665668763. The reversal of 665668760 is 67866566.

665668760 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665668760² = 886229796079875200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665668699 and 665668708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665668763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360857 + ... + 362696.

It is an arithmetic number, because the mean of its divisors is an integer number (48839895).

Almost surely, 2^665668760 is an apocalyptic number.

It is an amenable number.

665668760 is an abundant number, since it is smaller than the sum of its proper divisors (897207880).

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

665668760 is a wasteful number, since it uses less digits than its factorization.

665668760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723587 (or 723583 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 50.

The square root of 665668760 is about 25800.5573583208. The cubic root of 665668760 is about 873.1443711887.

The spelling of 665668760 in words is "six hundred sixty-five million, six hundred sixty-eight thousand, seven hundred sixty".