66356413 has 4 divisors (see below), whose sum is σ = 66648960. Its totient is φ = 66063868.

The previous prime is 66356401. The next prime is 66356419. The reversal of 66356413 is 31465366.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31465366 = 2 ⋅15732683.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66356413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66356419) 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, 145933 + ... + 146386.

It is an arithmetic number, because the mean of its divisors is an integer number (16662240).

Almost surely, 2^66356413 is an apocalyptic number.

It is an amenable number.

66356413 is a deficient number, since it is larger than the sum of its proper divisors (292547).

66356413 is a wasteful number, since it uses less digits than its factorization.

66356413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292546.

The product of its digits is 38880, while the sum is 34.

The square root of 66356413 is about 8145.9445738355. The cubic root of 66356413 is about 404.8501462565.

The spelling of 66356413 in words is "sixty-six million, three hundred fifty-six thousand, four hundred thirteen".