1121558218553 has 2 divisors, whose sum is σ = 1121558218554. Its totient is φ = 1121558218552.

The previous prime is 1121558218523. The next prime is 1121558218591. The reversal of 1121558218553 is 3558128551211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1053480537664 + 68077680889 = 1026392^2 + 260917^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121558218553 - 2¹⁰ = 1121558217529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121558218498 and 1121558218507.

It is not a weakly prime, because it can be changed into another prime (1121558218523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560779109276 + 560779109277.

It is an arithmetic number, because the mean of its divisors is an integer number (560779109277).

Almost surely, 2^{1121558218553} is an apocalyptic number.

It is an amenable number.

1121558218553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121558218553 is an equidigital number, since it uses as much as digits as its factorization.

1121558218553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480000, while the sum is 47.

The spelling of 1121558218553 in words is "one trillion, one hundred twenty-one billion, five hundred fifty-eight million, two hundred eighteen thousand, five hundred fifty-three".