666775760 has 40 divisors (see below), whose sum is σ = 1771719936. Its totient is φ = 228608640.

The previous prime is 666775757. The next prime is 666775763. The reversal of 666775760 is 67577666.

666775760 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (666775757) and next prime (666775763).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×666775760³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666775699 and 666775708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666775763) 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, 594776 + ... + 595895.

Almost surely, 2^666775760 is an apocalyptic number.

It is an amenable number.

666775760 is an abundant number, since it is smaller than the sum of its proper divisors (1104944176).

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

666775760 is a wasteful number, since it uses less digits than its factorization.

666775760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190691 (or 1190685 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 50.

The square root of 666775760 is about 25822.0014716133. The cubic root of 666775760 is about 873.6281130398.

The spelling of 666775760 in words is "six hundred sixty-six million, seven hundred seventy-five thousand, seven hundred sixty".