11121991518457 has 2 divisors, whose sum is σ = 11121991518458. Its totient is φ = 11121991518456.

The previous prime is 11121991518427. The next prime is 11121991518523. The reversal of 11121991518457 is 75481519912111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10927811164176 + 194180354281 = 3305724^2 + 440659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11121991518457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11121991518398 and 11121991518407.

It is not a weakly prime, because it can be changed into another prime (11121991518427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560995759228 + 5560995759229.

It is an arithmetic number, because the mean of its divisors is an integer number (5560995759229).

Almost surely, 2^{11121991518457} is an apocalyptic number.

It is an amenable number.

11121991518457 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121991518457 is an equidigital number, since it uses as much as digits as its factorization.

11121991518457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 55.

The spelling of 11121991518457 in words is "eleven trillion, one hundred twenty-one billion, nine hundred ninety-one million, five hundred eighteen thousand, four hundred fifty-seven".