61664345 has 4 divisors (see below), whose sum is σ = 73997220. Its totient is φ = 49331472.

The previous prime is 61664333. The next prime is 61664359. The reversal of 61664345 is 54346616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47706649 + 13957696 = 6907^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 61664345 - 2¹⁴ = 61647961 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6166430 + ... + 6166439.

It is an arithmetic number, because the mean of its divisors is an integer number (18499305).

Almost surely, 2^61664345 is an apocalyptic number.

It is an amenable number.

61664345 is a deficient number, since it is larger than the sum of its proper divisors (12332875).

61664345 is a wasteful number, since it uses less digits than its factorization.

61664345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12332874.

The product of its digits is 51840, while the sum is 35.

The square root of 61664345 is about 7852.6648343094. The cubic root of 61664345 is about 395.0736283193.

The spelling of 61664345 in words is "sixty-one million, six hundred sixty-four thousand, three hundred forty-five".