1648532643 has 4 divisors (see below), whose sum is σ = 2198043528. Its totient is φ = 1099021760.

The previous prime is 1648532623. The next prime is 1648532657. The reversal of 1648532643 is 3462358461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1648532643 - 2¹⁸ = 1648270499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1648532595 and 1648532604.

It is not an unprimeable number, because it can be changed into a prime (1648532603) 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 3 ways as a sum of consecutive naturals, for example, 274755438 + ... + 274755443.

It is an arithmetic number, because the mean of its divisors is an integer number (549510882).

Almost surely, 2^1648532643 is an apocalyptic number.

1648532643 is a deficient number, since it is larger than the sum of its proper divisors (549510885).

1648532643 is an equidigital number, since it uses as much as digits as its factorization.

1648532643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549510884.

The product of its digits is 414720, while the sum is 42.

The square root of 1648532643 is about 40602.1260896520. The cubic root of 1648532643 is about 1181.3153585963.

The spelling of 1648532643 in words is "one billion, six hundred forty-eight million, five hundred thirty-two thousand, six hundred forty-three".