1208853538561 has 2 divisors, whose sum is σ = 1208853538562.
Its totient is φ = 1208853538560.
The previous prime is 1208853538511. The next prime is 1208853538579. The reversal of 1208853538561 is 1658353588021.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 837051159025 + 371802379536 = 914905^2 + 609756^2
It is a cyclic number.
It is not a de Polignac number, because 1208853538561 - 215 = 1208853505793 is a prime.
It is a super-2 number, since 2×12088535385612 (a number of 25 digits) contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (1208853538511) 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 as a sum of consecutive naturals, namely, 604426769280 + 604426769281.
It is an arithmetic number, because the mean of its divisors is an integer number (604426769281).
Almost surely, 21208853538561 is an apocalyptic number.
It is an amenable number.
1208853538561 is a deficient number, since it is larger than the sum of its proper divisors (1).
1208853538561 is an equidigital number, since it uses as much as digits as its factorization.
1208853538561 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 6912000, while the sum is 55.
The spelling of 1208853538561 in words is "one trillion, two hundred eight billion, eight hundred fifty-three million, five hundred thirty-eight thousand, five hundred sixty-one".