163561661453 has 8 divisors (see below), whose sum is σ = 165724428600. Its totient is φ = 161406116608.

The previous prime is 163561661401. The next prime is 163561661533. The reversal of 163561661453 is 354166165361.

It can be written as a sum of positive squares in 4 ways, for example, as 314956009 + 163246705444 = 17747^2 + 404038^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163561661453 - 2³² = 159266694157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163561661398 and 163561661407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163561661353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1759976 + ... + 1850577.

It is an arithmetic number, because the mean of its divisors is an integer number (20715553575).

Almost surely, 2^163561661453 is an apocalyptic number.

It is an amenable number.

163561661453 is a deficient number, since it is larger than the sum of its proper divisors (2162767147).

163561661453 is an equidigital number, since it uses as much as digits as its factorization.

163561661453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3611151.

The product of its digits is 1166400, while the sum is 47.

The spelling of 163561661453 in words is "one hundred sixty-three billion, five hundred sixty-one million, six hundred sixty-one thousand, four hundred fifty-three".