64665443061 has 12 divisors (see below), whose sum is σ = 93528390540. Its totient is φ = 43053641280.

The previous prime is 64665443053. The next prime is 64665443099. The reversal of 64665443061 is 16034456646.

64665443061 is a `hidden beast` number, since 6 + 46 + 6 + 544 + 3 + 0 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1617246225 + 63048196836 = 40215^2 + 251094^2 .

It is not a de Polignac number, because 64665443061 - 2³ = 64665443053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64665442998 and 64665443016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64665444061) 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, 4713946 + ... + 4727643.

It is an arithmetic number, because the mean of its divisors is an integer number (7794032545).

Almost surely, 2^64665443061 is an apocalyptic number.

It is an amenable number.

64665443061 is a deficient number, since it is larger than the sum of its proper divisors (28862947479).

64665443061 is a wasteful number, since it uses less digits than its factorization.

64665443061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9442356 (or 9442353 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 64665443061 in words is "sixty-four billion, six hundred sixty-five million, four hundred forty-three thousand, sixty-one".