7764491798645 has 16 divisors (see below), whose sum is σ = 10205660622960. Its totient is φ = 5644612291584.

The previous prime is 7764491798639. The next prime is 7764491798681. The reversal of 7764491798645 is 5468971944677.

It can be written as a sum of positive squares in 8 ways, for example, as 57910497316 + 7706581301329 = 240646^2 + 2776073^2 .

It is not a de Polignac number, because 7764491798645 - 2⁸ = 7764491798389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1574945162 + ... + 1574950091.

It is an arithmetic number, because the mean of its divisors is an integer number (637853788935).

Almost surely, 2^{7764491798645} is an apocalyptic number.

It is an amenable number.

7764491798645 is a deficient number, since it is larger than the sum of its proper divisors (2441168824315).

7764491798645 is a wasteful number, since it uses less digits than its factorization.

7764491798645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3149895304.

The product of its digits is 2560481280, while the sum is 77.

The spelling of 7764491798645 in words is "seven trillion, seven hundred sixty-four billion, four hundred ninety-one million, seven hundred ninety-eight thousand, six hundred forty-five".