765980089561 has 2 divisors, whose sum is σ = 765980089562. Its totient is φ = 765980089560.

The previous prime is 765980089513. The next prime is 765980089577. The reversal of 765980089561 is 165980089567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 494272272025 + 271707817536 = 703045^2 + 521256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-765980089561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 765980089493 and 765980089502.

It is not a weakly prime, because it can be changed into another prime (765980089591) 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, 382990044780 + 382990044781.

It is an arithmetic number, because the mean of its divisors is an integer number (382990044781).

Almost surely, 2^765980089561 is an apocalyptic number.

It is an amenable number.

765980089561 is a deficient number, since it is larger than the sum of its proper divisors (1).

765980089561 is an equidigital number, since it uses as much as digits as its factorization.

765980089561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32659200, while the sum is 64.

The spelling of 765980089561 in words is "seven hundred sixty-five billion, nine hundred eighty million, eighty-nine thousand, five hundred sixty-one".