765619750009 has 9 divisors (see below), whose sum is σ = 767265648141. Its totient is φ = 763977380640.

The previous prime is 765619749941. The next prime is 765619750067. The reversal of 765619750009 is 900057916567.

It is a happy number.

The square root of 765619750009 is 874997.

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

It can be written as a sum of positive squares in 4 ways, for example, as 239664098025 + 525955651984 = 489555^2 + 725228^2 .

It is not a de Polignac number, because 765619750009 - 2⁹ = 765619749497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (765619750309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 749871919 + ... + 749872939.

Almost surely, 2^765619750009 is an apocalyptic number.

765619750009 is the 874997-th square number.

765619750009 is the 437499-th centered octagonal number.

It is an amenable number.

765619750009 is a deficient number, since it is larger than the sum of its proper divisors (1645898132).

765619750009 is an frugal number, since it uses more digits than its factorization.

765619750009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3756 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 3572100, while the sum is 55.

The spelling of 765619750009 in words is "seven hundred sixty-five billion, six hundred nineteen million, seven hundred fifty thousand, nine".