648188665 has 32 divisors (see below), whose sum is σ = 850988160. Its totient is φ = 472034304.

The previous prime is 648188647. The next prime is 648188683. The reversal of 648188665 is 566881846.

648188665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (648188647) and next prime (648188683).

It is a cyclic number.

It is not a de Polignac number, because 648188665 - 2¹⁹ = 647664377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397582 + ... + 399208.

It is an arithmetic number, because the mean of its divisors is an integer number (26593380).

Almost surely, 2^648188665 is an apocalyptic number.

It is an amenable number.

648188665 is a deficient number, since it is larger than the sum of its proper divisors (202799495).

648188665 is a wasteful number, since it uses less digits than its factorization.

648188665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801.

The product of its digits is 2211840, while the sum is 52.

The square root of 648188665 is about 25459.5495836042. The cubic root of 648188665 is about 865.4337161388.

The spelling of 648188665 in words is "six hundred forty-eight million, one hundred eighty-eight thousand, six hundred sixty-five".