764636161 has 2 divisors, whose sum is σ = 764636162. Its totient is φ = 764636160.

The previous prime is 764636153. The next prime is 764636177. The reversal of 764636161 is 161636467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 675220225 + 89415936 = 25985^2 + 9456^2 .

It is an emirp because it is prime and its reverse (161636467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 764636161 - 2³ = 764636153 is a prime.

It is not a weakly prime, because it can be changed into another prime (764636461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382318080 + 382318081.

It is an arithmetic number, because the mean of its divisors is an integer number (382318081).

Almost surely, 2^764636161 is an apocalyptic number.

It is an amenable number.

764636161 is a deficient number, since it is larger than the sum of its proper divisors (1).

764636161 is an equidigital number, since it uses as much as digits as its factorization.

764636161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 40.

The square root of 764636161 is about 27652.0552762358. The cubic root of 764636161 is about 914.4324113838.

The spelling of 764636161 in words is "seven hundred sixty-four million, six hundred thirty-six thousand, one hundred sixty-one".