61666616 has 32 divisors (see below), whose sum is σ = 133559280. Its totient is φ = 26380800.

The previous prime is 61666589. The next prime is 61666639.

61666616 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 61666616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19115 + ... + 22106.

Almost surely, 2^61666616 is an apocalyptic number.

It is an amenable number.

61666616 is an abundant number, since it is smaller than the sum of its proper divisors (71892664).

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

61666616 is a wasteful number, since it uses less digits than its factorization.

61666616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41255 (or 41251 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 61666616 is about 7852.8094335722. The cubic root of 61666616 is about 395.0784782381.

The spelling of 61666616 in words is "sixty-one million, six hundred sixty-six thousand, six hundred sixteen".