61664941 has 8 divisors (see below), whose sum is σ = 66629024. Its totient is φ = 56732400.

The previous prime is 61664887. The next prime is 61664947. The reversal of 61664941 is 14946616.

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 61664941 - 2¹⁷ = 61533869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61664941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61664947) 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, 3735 + ... + 11716.

It is an arithmetic number, because the mean of its divisors is an integer number (8328628).

Almost surely, 2^61664941 is an apocalyptic number.

It is an amenable number.

61664941 is a deficient number, since it is larger than the sum of its proper divisors (4964083).

61664941 is a wasteful number, since it uses less digits than its factorization.

61664941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15771.

The product of its digits is 31104, while the sum is 37.

The square root of 61664941 is about 7852.7027831187. The cubic root of 61664941 is about 395.0749011409.

The spelling of 61664941 in words is "sixty-one million, six hundred sixty-four thousand, nine hundred forty-one".