8272561320161 has 4 divisors (see below), whose sum is σ = 8707959284400. Its totient is φ = 7837163355924.

The previous prime is 8272561320131. The next prime is 8272561320181. The reversal of 8272561320161 is 1610231652728.

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 8272561320161 - 2²⁶ = 8272494211297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8272561320131) 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, 217698982091 + ... + 217698982128.

It is an arithmetic number, because the mean of its divisors is an integer number (2176989821100).

Almost surely, 2^{8272561320161} is an apocalyptic number.

It is an amenable number.

8272561320161 is a deficient number, since it is larger than the sum of its proper divisors (435397964239).

8272561320161 is a wasteful number, since it uses less digits than its factorization.

8272561320161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435397964238.

The product of its (nonzero) digits is 241920, while the sum is 44.

Adding to 8272561320161 its reverse (1610231652728), we get a palindrome (9882792972889).

The spelling of 8272561320161 in words is "eight trillion, two hundred seventy-two billion, five hundred sixty-one million, three hundred twenty thousand, one hundred sixty-one".