773127666221 has 16 divisors (see below), whose sum is σ = 841703108400. Its totient is φ = 707370513408.

The previous prime is 773127666193. The next prime is 773127666251. The reversal of 773127666221 is 122666721377.

It can be written as a sum of positive squares in 8 ways, for example, as 71495272996 + 701632393225 = 267386^2 + 837635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-773127666221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 773127666221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (773127666251) 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 in 15 ways as a sum of consecutive naturals, for example, 3837926 + ... + 4034343.

It is an arithmetic number, because the mean of its divisors is an integer number (52606444275).

Almost surely, 2^773127666221 is an apocalyptic number.

It is an amenable number.

773127666221 is a deficient number, since it is larger than the sum of its proper divisors (68575442179).

773127666221 is a wasteful number, since it uses less digits than its factorization.

773127666221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7872448.

The product of its digits is 1778112, while the sum is 50.

The spelling of 773127666221 in words is "seven hundred seventy-three billion, one hundred twenty-seven million, six hundred sixty-six thousand, two hundred twenty-one".