61668135 has 20 divisors (see below), whose sum is σ = 110546568. Its totient is φ = 32889456.

The previous prime is 61668121. The next prime is 61668151. The reversal of 61668135 is 53186616.

It is a happy number.

61668135 is a `hidden beast` number, since 616 + 6 + 8 + 1 + 35 = 666.

It is not a de Polignac number, because 61668135 - 2⁶ = 61668071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61668135.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 75729 + ... + 76538.

Almost surely, 2^61668135 is an apocalyptic number.

61668135 is a deficient number, since it is larger than the sum of its proper divisors (48878433).

61668135 is a wasteful number, since it uses less digits than its factorization.

61668135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152284 (or 152275 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 61668135 is about 7852.9061499549. The cubic root of 61668135 is about 395.0817221288.

The spelling of 61668135 in words is "sixty-one million, six hundred sixty-eight thousand, one hundred thirty-five".