135603666 has 64 divisors (see below), whose sum is σ = 330946560. Its totient is φ = 40816080.

The previous prime is 135603661. The next prime is 135603667. The reversal of 135603666 is 666306531.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 135603666.

It is not an unprimeable number, because it can be changed into a prime (135603661) 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 in 31 ways as a sum of consecutive naturals, for example, 98515 + ... + 99881.

It is an arithmetic number, because the mean of its divisors is an integer number (5171040).

Almost surely, 2^135603666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135603666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165473280).

135603666 is an abundant number, since it is smaller than the sum of its proper divisors (195342894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135603666 is a wasteful number, since it uses less digits than its factorization.

135603666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556 (or 1550 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 135603666 is about 11644.8987114530. The cubic root of 135603666 is about 513.7562799595.

The spelling of 135603666 in words is "one hundred thirty-five million, six hundred three thousand, six hundred sixty-six".