648432665 has 16 divisors (see below), whose sum is σ = 819851520. Its totient is φ = 490976640.

The previous prime is 648432643. The next prime is 648432677. The reversal of 648432665 is 566234846.

648432665 = T₂₅₄ + T₂₅₅ + ... + T₁₅₇₄.

It is not a de Polignac number, because 648432665 - 2⁶ = 648432601 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122912 + ... + 128078.

It is an arithmetic number, because the mean of its divisors is an integer number (51240720).

Almost surely, 2^648432665 is an apocalyptic number.

It is an amenable number.

648432665 is a deficient number, since it is larger than the sum of its proper divisors (171418855).

648432665 is a wasteful number, since it uses less digits than its factorization.

648432665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6512.

The product of its digits is 829440, while the sum is 44.

The square root of 648432665 is about 25464.3410478261. The cubic root of 648432665 is about 865.5422952953.

The spelling of 648432665 in words is "six hundred forty-eight million, four hundred thirty-two thousand, six hundred sixty-five".