135666373 has 2 divisors, whose sum is σ = 135666374. Its totient is φ = 135666372.

The previous prime is 135666361. The next prime is 135666389. The reversal of 135666373 is 373666531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76422564 + 59243809 = 8742^2 + 7697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135666373 is a prime.

It is equal to p_7680955 and since 135666373 and 7680955 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135663373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67833186 + 67833187.

It is an arithmetic number, because the mean of its divisors is an integer number (67833187).

Almost surely, 2^135666373 is an apocalyptic number.

It is an amenable number.

135666373 is a deficient number, since it is larger than the sum of its proper divisors (1).

135666373 is an equidigital number, since it uses as much as digits as its factorization.

135666373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 40.

The square root of 135666373 is about 11647.5908667844. The cubic root of 135666373 is about 513.8354596046.

The spelling of 135666373 in words is "one hundred thirty-five million, six hundred sixty-six thousand, three hundred seventy-three".