649094665 has 4 divisors (see below), whose sum is σ = 778913604. Its totient is φ = 519275728.

The previous prime is 649094627. The next prime is 649094669. The reversal of 649094665 is 566490946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 318836736 + 330257929 = 17856^2 + 18173^2 .

It is a cyclic number.

It is not a de Polignac number, because 649094665 - 2¹¹ = 649092617 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649094669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64909462 + ... + 64909471.

It is an arithmetic number, because the mean of its divisors is an integer number (194728401).

Almost surely, 2^649094665 is an apocalyptic number.

It is an amenable number.

649094665 is a deficient number, since it is larger than the sum of its proper divisors (129818939).

649094665 is a wasteful number, since it uses less digits than its factorization.

649094665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129818938.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The square root of 649094665 is about 25477.3363011128. The cubic root of 649094665 is about 865.8367458725.

The spelling of 649094665 in words is "six hundred forty-nine million, ninety-four thousand, six hundred sixty-five".