66345613 has 8 divisors (see below), whose sum is σ = 67728056. Its totient is φ = 64972800.

The previous prime is 66345607. The next prime is 66345637. The reversal of 66345613 is 31654366.

It can be written as a sum of positive squares in 4 ways, for example, as 1671849 + 64673764 = 1293^2 + 8042^2 .

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 66345613 - 2⁵ = 66345581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66345313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12445 + ... + 16957.

It is an arithmetic number, because the mean of its divisors is an integer number (8466007).

Almost surely, 2^66345613 is an apocalyptic number.

It is an amenable number.

66345613 is a deficient number, since it is larger than the sum of its proper divisors (1382443).

66345613 is a wasteful number, since it uses less digits than its factorization.

66345613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4815.

The product of its digits is 38880, while the sum is 34.

The square root of 66345613 is about 8145.2816403118. The cubic root of 66345613 is about 404.8281809401.

Adding to 66345613 its reverse (31654366), we get a palindrome (97999979).

The spelling of 66345613 in words is "sixty-six million, three hundred forty-five thousand, six hundred thirteen".