1091671818617 has 2 divisors, whose sum is σ = 1091671818618. Its totient is φ = 1091671818616.

The previous prime is 1091671818547. The next prime is 1091671818673. The reversal of 1091671818617 is 7168181761901.

It is an a-pointer prime, because the next prime (1091671818673) can be obtained adding 1091671818617 to its sum of digits (56).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1091563158841 + 108659776 = 1044779^2 + 10424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091671818617 - 2⁸ = 1091671818361 is a prime.

It is a super-3 number, since 3×1091671818617³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1091671812617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545835909308 + 545835909309.

It is an arithmetic number, because the mean of its divisors is an integer number (545835909309).

Almost surely, 2^{1091671818617} is an apocalyptic number.

It is an amenable number.

1091671818617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091671818617 is an equidigital number, since it uses as much as digits as its factorization.

1091671818617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 56.

Subtracting from 1091671818617 its sum of digits (56), we obtain a square (1091671818561 = 1044831²).

The spelling of 1091671818617 in words is "one trillion, ninety-one billion, six hundred seventy-one million, eight hundred eighteen thousand, six hundred seventeen".