7725915161 has 2 divisors, whose sum is σ = 7725915162. Its totient is φ = 7725915160.

The previous prime is 7725915133. The next prime is 7725915179. The reversal of 7725915161 is 1615195277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6978931600 + 746983561 = 83540^2 + 27331^2 .

It is a cyclic number.

It is not a de Polignac number, because 7725915161 - 2²² = 7721720857 is a prime.

It is not a weakly prime, because it can be changed into another prime (7725915121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3862957580 + 3862957581.

It is an arithmetic number, because the mean of its divisors is an integer number (3862957581).

Almost surely, 2^7725915161 is an apocalyptic number.

It is an amenable number.

7725915161 is a deficient number, since it is larger than the sum of its proper divisors (1).

7725915161 is an equidigital number, since it uses as much as digits as its factorization.

7725915161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132300, while the sum is 44.

The square root of 7725915161 is about 87897.1851710850. The cubic root of 7725915161 is about 1976.8936736344.

The spelling of 7725915161 in words is "seven billion, seven hundred twenty-five million, nine hundred fifteen thousand, one hundred sixty-one".