163656043361 has 4 divisors (see below), whose sum is σ = 163658040000. Its totient is φ = 163654046724.

The previous prime is 163656043339. The next prime is 163656043363. The reversal of 163656043361 is 163340656361.

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, and also an emirpimes, since its reverse is a distinct semiprime: 163340656361 = 31 ⋅5269053431.

It is a cyclic number.

It is not a de Polignac number, because 163656043361 - 2¹⁰ = 163656042337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163656043363) 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, 869861 + ... + 1041138.

It is an arithmetic number, because the mean of its divisors is an integer number (40914510000).

Almost surely, 2^163656043361 is an apocalyptic number.

It is an amenable number.

163656043361 is a deficient number, since it is larger than the sum of its proper divisors (1996639).

163656043361 is an equidigital number, since it uses as much as digits as its factorization.

163656043361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996638.

The product of its (nonzero) digits is 699840, while the sum is 44.

The spelling of 163656043361 in words is "one hundred sixty-three billion, six hundred fifty-six million, forty-three thousand, three hundred sixty-one".