181366137092669 has 2 divisors, whose sum is σ = 181366137092670. Its totient is φ = 181366137092668.

The previous prime is 181366137092663. The next prime is 181366137092689. The reversal of 181366137092669 is 966290731663181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181236348384025 + 129788708644 = 13462405^2 + 360262^2 .

It is a cyclic number.

It is not a de Polignac number, because 181366137092669 - 2¹² = 181366137088573 is a prime.

It is a super-2 number, since 2×181366137092669² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181366137092599 and 181366137092608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181366137092663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90683068546334 + 90683068546335.

It is an arithmetic number, because the mean of its divisors is an integer number (90683068546335).

Almost surely, 2^{181366137092669} is an apocalyptic number.

It is an amenable number.

181366137092669 is a deficient number, since it is larger than the sum of its proper divisors (1).

181366137092669 is an equidigital number, since it uses as much as digits as its factorization.

181366137092669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105815808, while the sum is 68.

The spelling of 181366137092669 in words is "one hundred eighty-one trillion, three hundred sixty-six billion, one hundred thirty-seven million, ninety-two thousand, six hundred sixty-nine".