135666945 has 24 divisors (see below), whose sum is σ = 235563432. Its totient is φ = 72230400.

The previous prime is 135666931. The next prime is 135666961. The reversal of 135666945 is 549666531.

It can be written as a sum of positive squares in 4 ways, for example, as 20061441 + 115605504 = 4479^2 + 10752^2 .

It is not a de Polignac number, because 135666945 - 2⁴ = 135666929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 135666945.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27465 + ... + 32025.

It is an arithmetic number, because the mean of its divisors is an integer number (9815143).

Almost surely, 2^135666945 is an apocalyptic number.

135666945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135666945 is a deficient number, since it is larger than the sum of its proper divisors (99896487).

135666945 is a wasteful number, since it uses less digits than its factorization.

135666945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233 (or 5230 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 135666945 is about 11647.6154211924. The cubic root of 135666945 is about 513.8361817522.

The spelling of 135666945 in words is "one hundred thirty-five million, six hundred sixty-six thousand, nine hundred forty-five".