649073663 has 16 divisors (see below), whose sum is σ = 750539520. Its totient is φ = 549819456.

The previous prime is 649073627. The next prime is 649073671. The reversal of 649073663 is 366370946.

It is a cyclic number.

It is not a de Polignac number, because 649073663 - 2²⁸ = 380638207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649073603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425420 + ... + 426942.

It is an arithmetic number, because the mean of its divisors is an integer number (46908720).

Almost surely, 2^649073663 is an apocalyptic number.

649073663 is a deficient number, since it is larger than the sum of its proper divisors (101465857).

649073663 is a wasteful number, since it uses less digits than its factorization.

649073663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206.

The product of its (nonzero) digits is 489888, while the sum is 44.

The square root of 649073663 is about 25476.9241275316. The cubic root of 649073663 is about 865.8274074814.

The spelling of 649073663 in words is "six hundred forty-nine million, seventy-three thousand, six hundred sixty-three".