201243266161 has 4 divisors (see below), whose sum is σ = 229992304192. Its totient is φ = 172494228132.

The previous prime is 201243266123. The next prime is 201243266177. The reversal of 201243266161 is 161662342102.

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 201243266161 - 2⁷ = 201243266033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201243266761) 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, 14374519005 + ... + 14374519018.

It is an arithmetic number, because the mean of its divisors is an integer number (57498076048).

Almost surely, 2^201243266161 is an apocalyptic number.

It is an amenable number.

201243266161 is a deficient number, since it is larger than the sum of its proper divisors (28749038031).

201243266161 is an equidigital number, since it uses as much as digits as its factorization.

201243266161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28749038030.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 201243266161 in words is "two hundred one billion, two hundred forty-three million, two hundred sixty-six thousand, one hundred sixty-one".