765395767161 has 27 divisors (see below), whose sum is σ = 1112065674447. Its totient is φ = 507284040960.

The previous prime is 765395767153. The next prime is 765395767177. The reversal of 765395767161 is 161767593567.

It is a happy number.

The square root of 765395767161 is 874869.

It is a perfect power (a square), and thus also a powerful number.

765395767161 is a `hidden beast` number, since 7 + 6 + 53 + 9 + 576 + 7 + 1 + 6 + 1 = 666.

765395767161 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 185446503225 + 579949263936 = 430635^2 + 761544^2 .

It is not a de Polignac number, because 765395767161 - 2³ = 765395767153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (765395767151) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 506548396 + ... + 506549906.

Almost surely, 2^765395767161 is an apocalyptic number.

765395767161 is the 874869-th square number.

765395767161 is the 437435-th centered octagonal number.

It is an amenable number.

765395767161 is a deficient number, since it is larger than the sum of its proper divisors (346669907286).

765395767161 is an frugal number, since it uses more digits than its factorization.

765395767161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414 (or 1707 counting only the distinct ones).

The product of its digits is 50009400, while the sum is 63.

The spelling of 765395767161 in words is "seven hundred sixty-five billion, three hundred ninety-five million, seven hundred sixty-seven thousand, one hundred sixty-one".