61664173 has 8 divisors (see below), whose sum is σ = 64427328. Its totient is φ = 58907904.

The previous prime is 61664171. The next prime is 61664191. The reversal of 61664173 is 37146616.

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

It is a cyclic number.

It is not a de Polignac number, because 61664173 - 2¹ = 61664171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61664171) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 26890 + ... + 29092.

It is an arithmetic number, because the mean of its divisors is an integer number (8053416).

Almost surely, 2^61664173 is an apocalyptic number.

It is an amenable number.

61664173 is a deficient number, since it is larger than the sum of its proper divisors (2763155).

61664173 is a wasteful number, since it uses less digits than its factorization.

61664173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3443.

The product of its digits is 18144, while the sum is 34.

The square root of 61664173 is about 7852.6538826055. The cubic root of 61664173 is about 395.0732609934.

The spelling of 61664173 in words is "sixty-one million, six hundred sixty-four thousand, one hundred seventy-three".