7205012161 has 4 divisors (see below), whose sum is σ = 7271113300. Its totient is φ = 7138911024.

The previous prime is 7205012159. The next prime is 7205012197. The reversal of 7205012161 is 1612105027.

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 6493136400 + 711875761 = 80580^2 + 26681^2 .

It is a cyclic number.

It is not a de Polignac number, because 7205012161 - 2¹ = 7205012159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7205010161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33050406 + ... + 33050623.

It is an arithmetic number, because the mean of its divisors is an integer number (1817778325).

Almost surely, 2^7205012161 is an apocalyptic number.

It is an amenable number.

7205012161 is a deficient number, since it is larger than the sum of its proper divisors (66101139).

7205012161 is a wasteful number, since it uses less digits than its factorization.

7205012161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66101138.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 7205012161 is about 84882.3430461247. The cubic root of 7205012161 is about 1931.4267382637.

Adding to 7205012161 its reverse (1612105027), we get a palindrome (8817117188).

The spelling of 7205012161 in words is "seven billion, two hundred five million, twelve thousand, one hundred sixty-one".