64666845 has 12 divisors (see below), whose sum is σ = 112089276. Its totient is φ = 34488960.

The previous prime is 64666829. The next prime is 64666853. The reversal of 64666845 is 54866646.

It can be written as a sum of positive squares in 2 ways, for example, as 16475481 + 48191364 = 4059^2 + 6942^2 .

It is not a de Polignac number, because 64666845 - 2⁴ = 64666829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1437041 = 64666845 / (6 + 4 + 6 + 6 + 6 + 8 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 64666845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 718476 + ... + 718565.

It is an arithmetic number, because the mean of its divisors is an integer number (9340773).

Almost surely, 2^64666845 is an apocalyptic number.

It is an amenable number.

64666845 is a deficient number, since it is larger than the sum of its proper divisors (47422431).

64666845 is a wasteful number, since it uses less digits than its factorization.

64666845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437052 (or 1437049 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 64666845 is about 8041.5698094340. The cubic root of 64666845 is about 401.3844630434.

The spelling of 64666845 in words is "sixty-four million, six hundred sixty-six thousand, eight hundred forty-five".