66347613 has 8 divisors (see below), whose sum is σ = 98292800. Its totient is φ = 44231724.

The previous prime is 66347599. The next prime is 66347647. The reversal of 66347613 is 31674366.

It is a happy number.

66347613 is a `hidden beast` number, since 6 + 6 + 34 + 7 + 613 = 666.

It is not a de Polignac number, because 66347613 - 2¹² = 66343517 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 (66347653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1228633 + ... + 1228686.

It is an arithmetic number, because the mean of its divisors is an integer number (12286600).

Almost surely, 2^66347613 is an apocalyptic number.

It is an amenable number.

66347613 is a deficient number, since it is larger than the sum of its proper divisors (31945187).

66347613 is a wasteful number, since it uses less digits than its factorization.

66347613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457328 (or 2457322 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 66347613 is about 8145.4044098498. The cubic root of 66347613 is about 404.8322487711.

The spelling of 66347613 in words is "sixty-six million, three hundred forty-seven thousand, six hundred thirteen".