765721026641 has 16 divisors (see below), whose sum is σ = 786904263936. Its totient is φ = 744660240000.

The previous prime is 765721026619. The next prime is 765721026643. The reversal of 765721026641 is 146620127567.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-765721026641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (765721026643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20851106 + ... + 20887796.

It is an arithmetic number, because the mean of its divisors is an integer number (49181516496).

Almost surely, 2^765721026641 is an apocalyptic number.

It is an amenable number.

765721026641 is a deficient number, since it is larger than the sum of its proper divisors (21183237295).

765721026641 is a wasteful number, since it uses less digits than its factorization.

765721026641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38344.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 765721026641 in words is "seven hundred sixty-five billion, seven hundred twenty-one million, twenty-six thousand, six hundred forty-one".