1178465221553 has 2 divisors, whose sum is σ = 1178465221554. Its totient is φ = 1178465221552.

The previous prime is 1178465221487. The next prime is 1178465221561. The reversal of 1178465221553 is 3551225648711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 916984353649 + 261480867904 = 957593^2 + 511352^2 .

It is a cyclic number.

It is not a de Polignac number, because 1178465221553 - 2⁴⁰ = 78953593777 is a prime.

It is a super-2 number, since 2×1178465221553² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1178465221253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 589232610776 + 589232610777.

It is an arithmetic number, because the mean of its divisors is an integer number (589232610777).

Almost surely, 2^{1178465221553} is an apocalyptic number.

It is an amenable number.

1178465221553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1178465221553 is an equidigital number, since it uses as much as digits as its factorization.

1178465221553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016000, while the sum is 50.

The spelling of 1178465221553 in words is "one trillion, one hundred seventy-eight billion, four hundred sixty-five million, two hundred twenty-one thousand, five hundred fifty-three".