66305613 has 16 divisors (see below), whose sum is σ = 98689536. Its totient is φ = 39249840.

The previous prime is 66305609. The next prime is 66305633. The reversal of 66305613 is 31650366.

It is not a de Polignac number, because 66305613 - 2² = 66305609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66305633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21945 + ... + 24782.

It is an arithmetic number, because the mean of its divisors is an integer number (6168096).

Almost surely, 2^66305613 is an apocalyptic number.

It is an amenable number.

66305613 is a deficient number, since it is larger than the sum of its proper divisors (32383923).

66305613 is a wasteful number, since it uses less digits than its factorization.

66305613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46784.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 66305613 is about 8142.8258608422. The cubic root of 66305613 is about 404.7468071466.

Adding to 66305613 its reverse (31650366), we get a palindrome (97955979).

The spelling of 66305613 in words is "sixty-six million, three hundred five thousand, six hundred thirteen".