1648665321 has 32 divisors (see below), whose sum is σ = 2465861760. Its totient is φ = 973679616.

The previous prime is 1648665307. The next prime is 1648665349. The reversal of 1648665321 is 1235668461.

It is not a de Polignac number, because 1648665321 - 2⁵ = 1648665289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1648665301) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 146715 + ... + 157551.

It is an arithmetic number, because the mean of its divisors is an integer number (77058180).

Almost surely, 2^1648665321 is an apocalyptic number.

It is an amenable number.

1648665321 is a deficient number, since it is larger than the sum of its proper divisors (817196439).

1648665321 is a wasteful number, since it uses less digits than its factorization.

1648665321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11033.

The product of its digits is 207360, while the sum is 42.

The square root of 1648665321 is about 40603.7599367349. The cubic root of 1648665321 is about 1181.3470494772.

The spelling of 1648665321 in words is "one billion, six hundred forty-eight million, six hundred sixty-five thousand, three hundred twenty-one".