163543543323621 has 4 divisors (see below), whose sum is σ = 218058057764832. Its totient is φ = 109029028882412.

The previous prime is 163543543323593. The next prime is 163543543323707. The reversal of 163543543323621 is 126323345345361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 163543543323621 - 2⁷ = 163543543323493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163543543323521) 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, 27257257220601 + ... + 27257257220606.

It is an arithmetic number, because the mean of its divisors is an integer number (54514514441208).

Almost surely, 2^{163543543323621} is an apocalyptic number.

It is an amenable number.

163543543323621 is a deficient number, since it is larger than the sum of its proper divisors (54514514441211).

163543543323621 is an equidigital number, since it uses as much as digits as its factorization.

163543543323621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54514514441210.

The product of its digits is 13996800, while the sum is 51.

Adding to 163543543323621 its reverse (126323345345361), we get a palindrome (289866888668982).

The spelling of 163543543323621 in words is "one hundred sixty-three trillion, five hundred forty-three billion, five hundred forty-three million, three hundred twenty-three thousand, six hundred twenty-one".