66575413 has 4 divisors (see below), whose sum is σ = 66788428. Its totient is φ = 66362400.

The previous prime is 66575407. The next prime is 66575429. The reversal of 66575413 is 31457566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21511044 + 45064369 = 4638^2 + 6713^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66575413 is a prime.

It is a super-2 number, since 2×66575413² = 8864571232241138, 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 (66515413) 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, 106038 + ... + 106663.

It is an arithmetic number, because the mean of its divisors is an integer number (16697107).

Almost surely, 2^66575413 is an apocalyptic number.

It is an amenable number.

66575413 is a deficient number, since it is larger than the sum of its proper divisors (213015).

66575413 is a wasteful number, since it uses less digits than its factorization.

66575413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213014.

The product of its digits is 75600, while the sum is 37.

The square root of 66575413 is about 8159.3757726924. The cubic root of 66575413 is about 405.2950408163.

The spelling of 66575413 in words is "sixty-six million, five hundred seventy-five thousand, four hundred thirteen".