649073665 has 8 divisors (see below), whose sum is σ = 797885928. Its totient is φ = 506593920.

The previous prime is 649073627. The next prime is 649073671. The reversal of 649073665 is 566370946.

It can be written as a sum of positive squares in 4 ways, for example, as 33686416 + 615387249 = 5804^2 + 24807^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649073665 - 2²¹ = 646976513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1582902 + ... + 1583311.

It is an arithmetic number, because the mean of its divisors is an integer number (99735741).

Almost surely, 2^649073665 is an apocalyptic number.

It is an amenable number.

649073665 is a deficient number, since it is larger than the sum of its proper divisors (148812263).

649073665 is a wasteful number, since it uses less digits than its factorization.

649073665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166259.

The product of its (nonzero) digits is 816480, while the sum is 46.

The square root of 649073665 is about 25476.9241667828. The cubic root of 649073665 is about 865.8274083707.

The spelling of 649073665 in words is "six hundred forty-nine million, seventy-three thousand, six hundred sixty-five".