1265010161 has 2 divisors, whose sum is σ = 1265010162. Its totient is φ = 1265010160.

The previous prime is 1265010151. The next prime is 1265010169. The reversal of 1265010161 is 1610105621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1134342400 + 130667761 = 33680^2 + 11431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265010161 - 2²⁶ = 1197901297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265010169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632505080 + 632505081.

It is an arithmetic number, because the mean of its divisors is an integer number (632505081).

Almost surely, 2^1265010161 is an apocalyptic number.

It is an amenable number.

1265010161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265010161 is an equidigital number, since it uses as much as digits as its factorization.

1265010161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 1265010161 is about 35566.9813310042. The cubic root of 1265010161 is about 1081.5119886112.

Adding to 1265010161 its reverse (1610105621), we get a palindrome (2875115782).

The spelling of 1265010161 in words is "one billion, two hundred sixty-five million, ten thousand, one hundred sixty-one".