1108815991553 has 2 divisors, whose sum is σ = 1108815991554. Its totient is φ = 1108815991552.

The previous prime is 1108815991463. The next prime is 1108815991567. The reversal of 1108815991553 is 3551995188011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1078922618944 + 29893372609 = 1038712^2 + 172897^2 .

It is an emirp because it is prime and its reverse (3551995188011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1108815991553 - 2¹⁶ = 1108815926017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1108815991253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554407995776 + 554407995777.

It is an arithmetic number, because the mean of its divisors is an integer number (554407995777).

Almost surely, 2^{1108815991553} is an apocalyptic number.

It is an amenable number.

1108815991553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1108815991553 is an equidigital number, since it uses as much as digits as its factorization.

1108815991553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 56.

The spelling of 1108815991553 in words is "one trillion, one hundred eight billion, eight hundred fifteen million, nine hundred ninety-one thousand, five hundred fifty-three".