66206413 has 16 divisors (see below), whose sum is σ = 81684736. Its totient is φ = 52254720.

The previous prime is 66206407. The next prime is 66206417. The reversal of 66206413 is 31460266.

It is not a de Polignac number, because 66206413 - 2¹⁷ = 66075341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66206417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56845 + ... + 57997.

It is an arithmetic number, because the mean of its divisors is an integer number (5105296).

Almost surely, 2^66206413 is an apocalyptic number.

It is an amenable number.

66206413 is a deficient number, since it is larger than the sum of its proper divisors (15478323).

66206413 is a wasteful number, since it uses less digits than its factorization.

66206413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66206413 is about 8136.7323293814. The cubic root of 66206413 is about 404.5448588178.

Adding to 66206413 its reverse (31460266), we get a palindrome (97666679).

The spelling of 66206413 in words is "sixty-six million, two hundred six thousand, four hundred thirteen".