1366523111381 has 2 divisors, whose sum is σ = 1366523111382. Its totient is φ = 1366523111380.

The previous prime is 1366523111357. The next prime is 1366523111413. The reversal of 1366523111381 is 1831113256631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1101941470756 + 264581640625 = 1049734^2 + 514375^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366523111381 - 2¹⁴ = 1366523094997 is a prime.

It is a super-2 number, since 2×1366523111381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1366523111341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683261555690 + 683261555691.

It is an arithmetic number, because the mean of its divisors is an integer number (683261555691).

Almost surely, 2^{1366523111381} is an apocalyptic number.

It is an amenable number.

1366523111381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366523111381 is an equidigital number, since it uses as much as digits as its factorization.

1366523111381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The spelling of 1366523111381 in words is "one trillion, three hundred sixty-six billion, five hundred twenty-three million, one hundred eleven thousand, three hundred eighty-one".