1177748816221 has 2 divisors, whose sum is σ = 1177748816222. Its totient is φ = 1177748816220.

The previous prime is 1177748816173. The next prime is 1177748816303. The reversal of 1177748816221 is 1226188477711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079757904996 + 97990911225 = 1039114^2 + 313035^2 .

It is a cyclic number.

It is not a de Polignac number, because 1177748816221 - 2⁹ = 1177748815709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1177748816521) 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 as a sum of consecutive naturals, namely, 588874408110 + 588874408111.

It is an arithmetic number, because the mean of its divisors is an integer number (588874408111).

Almost surely, 2^{1177748816221} is an apocalyptic number.

It is an amenable number.

1177748816221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1177748816221 is an equidigital number, since it uses as much as digits as its factorization.

1177748816221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2107392, while the sum is 55.

The spelling of 1177748816221 in words is "one trillion, one hundred seventy-seven billion, seven hundred forty-eight million, eight hundred sixteen thousand, two hundred twenty-one".