66213325 has 6 divisors (see below), whose sum is σ = 82104554. Its totient is φ = 52970640.

The previous prime is 66213311. The next prime is 66213361. The reversal of 66213325 is 52331266.

It can be written as a sum of positive squares in 3 ways, for example, as 9753129 + 56460196 = 3123^2 + 7514^2 .

It is not a de Polignac number, because 66213325 - 2¹⁵ = 66180557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66213293 and 66213302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1324242 + ... + 1324291.

Almost surely, 2^66213325 is an apocalyptic number.

It is an amenable number.

66213325 is a deficient number, since it is larger than the sum of its proper divisors (15891229).

66213325 is a wasteful number, since it uses less digits than its factorization.

66213325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648543 (or 2648538 counting only the distinct ones).

The product of its digits is 6480, while the sum is 28.

The square root of 66213325 is about 8137.1570588259. The cubic root of 66213325 is about 404.5589365918.

The spelling of 66213325 in words is "sixty-six million, two hundred thirteen thousand, three hundred twenty-five".