163650201451661 has 4 divisors (see below), whose sum is σ = 173276683890012. Its totient is φ = 154023719013312.

The previous prime is 163650201451619. The next prime is 163650201451669. The reversal of 163650201451661 is 166154102056361.

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

It can be written as a sum of positive squares in 2 ways, for example, as 101883082501225 + 61767118950436 = 10093715^2 + 7859206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163650201451661 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 (163650201451669) 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, 4813241219150 + ... + 4813241219183.

It is an arithmetic number, because the mean of its divisors is an integer number (43319170972503).

Almost surely, 2^{163650201451661} is an apocalyptic number.

It is an amenable number.

163650201451661 is a deficient number, since it is larger than the sum of its proper divisors (9626482438351).

163650201451661 is an equidigital number, since it uses as much as digits as its factorization.

163650201451661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9626482438350.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 163650201451661 in words is "one hundred sixty-three trillion, six hundred fifty billion, two hundred one million, four hundred fifty-one thousand, six hundred sixty-one".