6665870745 has 12 divisors (see below), whose sum is σ = 11554176036. Its totient is φ = 3555131040.

The previous prime is 6665870737. The next prime is 6665870747. The reversal of 6665870745 is 5470785666.

It can be written as a sum of positive squares in 2 ways, for example, as 2266997769 + 4398872976 = 47613^2 + 66324^2 .

It is not a de Polignac number, because 6665870745 - 2³ = 6665870737 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6665870691 and 6665870700.

It is not an unprimeable number, because it can be changed into a prime (6665870747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74065186 + ... + 74065275.

It is an arithmetic number, because the mean of its divisors is an integer number (962848003).

Almost surely, 2^6665870745 is an apocalyptic number.

It is an amenable number.

6665870745 is a deficient number, since it is larger than the sum of its proper divisors (4888305291).

6665870745 is a wasteful number, since it uses less digits than its factorization.

6665870745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148130472 (or 148130469 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The square root of 6665870745 is about 81644.7839423928. The cubic root of 6665870745 is about 1881.9971556847.

The spelling of 6665870745 in words is "six billion, six hundred sixty-five million, eight hundred seventy thousand, seven hundred forty-five".