66822013 has 4 divisors (see below), whose sum is σ = 67232128. Its totient is φ = 66411900.

The previous prime is 66821999. The next prime is 66822047. The reversal of 66822013 is 31022866.

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.

It is a cyclic number.

It is not a de Polignac number, because 66822013 - 2¹⁷ = 66690941 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 (66822073) 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, 204813 + ... + 205138.

It is an arithmetic number, because the mean of its divisors is an integer number (16808032).

Almost surely, 2^66822013 is an apocalyptic number.

It is an amenable number.

66822013 is a deficient number, since it is larger than the sum of its proper divisors (410115).

66822013 is a wasteful number, since it uses less digits than its factorization.

66822013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410114.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 66822013 is about 8174.4732552012. The cubic root of 66822013 is about 405.7948379829.

Adding to 66822013 its reverse (31022866), we get a palindrome (97844879).

The spelling of 66822013 in words is "sixty-six million, eight hundred twenty-two thousand, thirteen".