1641322661243 has 4 divisors (see below), whose sum is σ = 1647709131000. Its totient is φ = 1634936191488.

The previous prime is 1641322661233. The next prime is 1641322661267. The reversal of 1641322661243 is 3421662231461.

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 1641322661243 - 2¹⁶ = 1641322595707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641322661243.

It is not an unprimeable number, because it can be changed into a prime (1641322661213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3193234493 + ... + 3193235006.

It is an arithmetic number, because the mean of its divisors is an integer number (411927282750).

Almost surely, 2^{1641322661243} is an apocalyptic number.

1641322661243 is a deficient number, since it is larger than the sum of its proper divisors (6386469757).

1641322661243 is an equidigital number, since it uses as much as digits as its factorization.

1641322661243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6386469756.

The product of its digits is 248832, while the sum is 41.

The spelling of 1641322661243 in words is "one trillion, six hundred forty-one billion, three hundred twenty-two million, six hundred sixty-one thousand, two hundred forty-three".