1643462461543 has 4 divisors (see below), whose sum is σ = 1878242813200. Its totient is φ = 1408682109888.

The previous prime is 1643462461519. The next prime is 1643462461591. The reversal of 1643462461543 is 3451642643461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643462461543 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 (1643462401543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117390175818 + ... + 117390175831.

It is an arithmetic number, because the mean of its divisors is an integer number (469560703300).

Almost surely, 2^{1643462461543} is an apocalyptic number.

1643462461543 is a deficient number, since it is larger than the sum of its proper divisors (234780351657).

1643462461543 is an equidigital number, since it uses as much as digits as its factorization.

1643462461543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234780351656.

The product of its digits is 4976640, while the sum is 49.

The spelling of 1643462461543 in words is "one trillion, six hundred forty-three billion, four hundred sixty-two million, four hundred sixty-one thousand, five hundred forty-three".