135666172 has 12 divisors (see below), whose sum is σ = 237564936. Its totient is φ = 67790480.

The previous prime is 135666169. The next prime is 135666191. The reversal of 135666172 is 271666531.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2854 + ... + 16717.

It is an arithmetic number, because the mean of its divisors is an integer number (19797078).

Almost surely, 2^135666172 is an apocalyptic number.

It is an amenable number.

135666172 is a deficient number, since it is larger than the sum of its proper divisors (101898764).

135666172 is a wasteful number, since it uses less digits than its factorization.

135666172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21308 (or 21306 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 135666172 is about 11647.5822383875. The cubic root of 135666172 is about 513.8352058424.

It can be divided in two parts, 1356 and 66172, that added together give a triangular number (67528 = T₃₆₇).

The spelling of 135666172 in words is "one hundred thirty-five million, six hundred sixty-six thousand, one hundred seventy-two".