61665306 has 8 divisors (see below), whose sum is σ = 123330624. Its totient is φ = 20555100.

The previous prime is 61665299. The next prime is 61665313. The reversal of 61665306 is 60356616.

61665306 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61665299) and next prime (61665313).

It is a sphenic number, since it is the product of 3 distinct primes.

61665306 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 5138770 + ... + 5138781.

It is an arithmetic number, because the mean of its divisors is an integer number (15416328).

Almost surely, 2^61665306 is an apocalyptic number.

61665306 is the 4967-th centered pentagonal number.

61665306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61665306 is a wasteful number, since it uses less digits than its factorization.

61665306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10277556.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 61665306 is about 7852.7260234902. The cubic root of 61665306 is about 395.0756806333.

The spelling of 61665306 in words is "sixty-one million, six hundred sixty-five thousand, three hundred six".