66726013 has 16 divisors (see below), whose sum is σ = 73094400. Its totient is φ = 60712960.

The previous prime is 66726001. The next prime is 66726017. The reversal of 66726013 is 31062766.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66726013 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 (66726017) 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, 46653 + ... + 48061.

It is an arithmetic number, because the mean of its divisors is an integer number (4568400).

Almost surely, 2^66726013 is an apocalyptic number.

It is an amenable number.

66726013 is a deficient number, since it is larger than the sum of its proper divisors (6368387).

66726013 is a wasteful number, since it uses less digits than its factorization.

66726013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66726013 is about 8168.5992067184. The cubic root of 66726013 is about 405.6004161492.

Adding to 66726013 its reverse (31062766), we get a palindrome (97788779).

The spelling of 66726013 in words is "sixty-six million, seven hundred twenty-six thousand, thirteen".