66576413 has 4 divisors (see below), whose sum is σ = 67055520. Its totient is φ = 66097308.

The previous prime is 66576409. The next prime is 66576457. The reversal of 66576413 is 31467566.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 66576413 - 2² = 66576409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66576463) 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, 239345 + ... + 239622.

It is an arithmetic number, because the mean of its divisors is an integer number (16763880).

Almost surely, 2^66576413 is an apocalyptic number.

It is an amenable number.

66576413 is a deficient number, since it is larger than the sum of its proper divisors (479107).

66576413 is a wasteful number, since it uses less digits than its factorization.

66576413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479106.

The product of its digits is 90720, while the sum is 38.

The square root of 66576413 is about 8159.4370516599. The cubic root of 66576413 is about 405.2970700590.

The spelling of 66576413 in words is "sixty-six million, five hundred seventy-six thousand, four hundred thirteen".