66013 has 4 divisors (see below), whose sum is σ = 66528. Its totient is φ = 65500.

The previous prime is 65993. The next prime is 66029. The reversal of 66013 is 31066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66013 - 2⁵ = 65981 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 (66083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120 + ... + 382.

It is an arithmetic number, because the mean of its divisors is an integer number (16632).

2⁶⁶⁰¹³ is an apocalyptic number.

It is an amenable number.

66013 is a deficient number, since it is larger than the sum of its proper divisors (515).

66013 is a wasteful number, since it uses less digits than its factorization.

66013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 66013 is about 256.9299515432. The cubic root of 66013 is about 40.4150533714.

Adding to 66013 its reverse (31066), we get a palindrome (97079).

The spelling of 66013 in words is "sixty-six thousand, thirteen".