7725206161 has 2 divisors, whose sum is σ = 7725206162. Its totient is φ = 7725206160.

The previous prime is 7725206149. The next prime is 7725206207. The reversal of 7725206161 is 1616025277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4055269761 + 3669936400 = 63681^2 + 60580^2 .

It is an emirp because it is prime and its reverse (1616025277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7725206161 - 2¹⁷ = 7725075089 is a prime.

It is a super-3 number, since 3×7725206161³ (a number of 31 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7725206161.

It is not a weakly prime, because it can be changed into another prime (7725206131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3862603080 + 3862603081.

It is an arithmetic number, because the mean of its divisors is an integer number (3862603081).

Almost surely, 2^7725206161 is an apocalyptic number.

It is an amenable number.

7725206161 is a deficient number, since it is larger than the sum of its proper divisors (1).

7725206161 is an equidigital number, since it uses as much as digits as its factorization.

7725206161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 7725206161 is about 87893.1519573624. The cubic root of 7725206161 is about 1976.8331992240.

The spelling of 7725206161 in words is "seven billion, seven hundred twenty-five million, two hundred six thousand, one hundred sixty-one".