7766721328641 has 16 divisors (see below), whose sum is σ = 11313736164288. Its totient is φ = 4700150936000.

The previous prime is 7766721328579. The next prime is 7766721328651. The reversal of 7766721328641 is 1468231276677.

It is a cyclic number.

It is not a de Polignac number, because 7766721328641 - 2⁶ = 7766721328577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7766721328651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173799810 + ... + 173844491.

It is an arithmetic number, because the mean of its divisors is an integer number (707108510268).

Almost surely, 2^{7766721328641} is an apocalyptic number.

It is an amenable number.

7766721328641 is a deficient number, since it is larger than the sum of its proper divisors (3547014835647).

7766721328641 is a wasteful number, since it uses less digits than its factorization.

7766721328641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347644992.

The product of its digits is 28449792, while the sum is 60.

The spelling of 7766721328641 in words is "seven trillion, seven hundred sixty-six billion, seven hundred twenty-one million, three hundred twenty-eight thousand, six hundred forty-one".