66604413 has 4 divisors (see below), whose sum is σ = 88805888. Its totient is φ = 44402940.

The previous prime is 66604409. The next prime is 66604427. The reversal of 66604413 is 31440666.

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 not a de Polignac number, because 66604413 - 2² = 66604409 is a prime.

It is a super-2 number, since 2×66604413² = 8872295662149138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66604613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11100733 + ... + 11100738.

It is an arithmetic number, because the mean of its divisors is an integer number (22201472).

Almost surely, 2^66604413 is an apocalyptic number.

It is an amenable number.

66604413 is a deficient number, since it is larger than the sum of its proper divisors (22201475).

66604413 is a wasteful number, since it uses less digits than its factorization.

66604413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22201474.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 66604413 is about 8161.1526759398. The cubic root of 66604413 is about 405.3538806065.

The spelling of 66604413 in words is "sixty-six million, six hundred four thousand, four hundred thirteen".