765725701981 has 2 divisors, whose sum is σ = 765725701982. Its totient is φ = 765725701980.

The previous prime is 765725701969. The next prime is 765725702009. The reversal of 765725701981 is 189107527567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 734526132025 + 31199569956 = 857045^2 + 176634^2 .

It is a cyclic number.

It is not a de Polignac number, because 765725701981 - 2¹⁵ = 765725669213 is a prime.

It is a super-2 number, since 2×765725701981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (765725741981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382862850990 + 382862850991.

It is an arithmetic number, because the mean of its divisors is an integer number (382862850991).

Almost surely, 2^765725701981 is an apocalyptic number.

It is an amenable number.

765725701981 is a deficient number, since it is larger than the sum of its proper divisors (1).

765725701981 is an equidigital number, since it uses as much as digits as its factorization.

765725701981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7408800, while the sum is 58.

The spelling of 765725701981 in words is "seven hundred sixty-five billion, seven hundred twenty-five million, seven hundred one thousand, nine hundred eighty-one".