163443827381 has 4 divisors (see below), whose sum is σ = 163445732064. Its totient is φ = 163441922700.

The previous prime is 163443827359. The next prime is 163443827383. The reversal of 163443827381 is 183728344361.

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 163443827381 - 2³⁰ = 162370085557 is a prime.

It is a super-2 number, since 2×163443827381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163443827383) 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, 817235 + ... + 997376.

It is an arithmetic number, because the mean of its divisors is an integer number (40861433016).

Almost surely, 2^163443827381 is an apocalyptic number.

It is an amenable number.

163443827381 is a deficient number, since it is larger than the sum of its proper divisors (1904683).

163443827381 is an equidigital number, since it uses as much as digits as its factorization.

163443827381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904682.

The product of its digits is 2322432, while the sum is 50.

The spelling of 163443827381 in words is "one hundred sixty-three billion, four hundred forty-three million, eight hundred twenty-seven thousand, three hundred eighty-one".