66654213 has 8 divisors (see below), whose sum is σ = 90199008. Its totient is φ = 43772784.

The previous prime is 66654197. The next prime is 66654221. The reversal of 66654213 is 31245666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66654213 - 2⁴ = 66654197 is a prime.

It is a super-2 number, since 2×66654213² = 8885568221298738, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66654283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165606 + ... + 166007.

It is an arithmetic number, because the mean of its divisors is an integer number (11274876).

Almost surely, 2^66654213 is an apocalyptic number.

It is an amenable number.

66654213 is a deficient number, since it is larger than the sum of its proper divisors (23544795).

66654213 is a wasteful number, since it uses less digits than its factorization.

66654213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331683.

The product of its digits is 25920, while the sum is 33.

The square root of 66654213 is about 8164.2031454392. The cubic root of 66654213 is about 405.4548828938.

Adding to 66654213 its reverse (31245666), we get a palindrome (97899879).

It can be divided in two parts, 6665 and 4213, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 66654213 in words is "sixty-six million, six hundred fifty-four thousand, two hundred thirteen".