66213530 has 8 divisors (see below), whose sum is σ = 119184372. Its totient is φ = 26485408.

The previous prime is 66213529. The next prime is 66213533. The reversal of 66213530 is 3531266.

It can be written as a sum of positive squares in 2 ways, for example, as 60078001 + 6135529 = 7751^2 + 2477^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 66213530.

It is not an unprimeable number, because it can be changed into a prime (66213533) 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, 3310667 + ... + 3310686.

Almost surely, 2^66213530 is an apocalyptic number.

66213530 is a deficient number, since it is larger than the sum of its proper divisors (52970842).

66213530 is a wasteful number, since it uses less digits than its factorization.

66213530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6621360.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 66213530 is about 8137.1696553531. The cubic root of 66213530 is about 404.5593541035.

Adding to 66213530 its reverse (3531266), we get a palindrome (69744796).

The spelling of 66213530 in words is "sixty-six million, two hundred thirteen thousand, five hundred thirty".