1355555666669 has 2 divisors, whose sum is σ = 1355555666670. Its totient is φ = 1355555666668.

The previous prime is 1355555666657. The next prime is 1355555666671. The reversal of 1355555666669 is 9666665555531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1328786452900 + 26769213769 = 1152730^2 + 163613^2 .

It is an emirp because it is prime and its reverse (9666665555531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355555666669 is a prime.

It is a super-2 number, since 2×1355555666669² (a number of 25 digits) contains 22 as substring.

Together with 1355555666671, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 1355555666599 and 1355555666608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1355555666609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677777833334 + 677777833335.

It is an arithmetic number, because the mean of its divisors is an integer number (677777833335).

Almost surely, 2^{1355555666669} is an apocalyptic number.

It is an amenable number.

1355555666669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1355555666669 is an equidigital number, since it uses as much as digits as its factorization.

1355555666669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 656100000, while the sum is 68.

The spelling of 1355555666669 in words is "one trillion, three hundred fifty-five billion, five hundred fifty-five million, six hundred sixty-six thousand, six hundred sixty-nine".