66355513 has 4 divisors (see below), whose sum is σ = 75834880. Its totient is φ = 56876148.

The previous prime is 66355489. The next prime is 66355517. The reversal of 66355513 is 31555366.

66355513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66355513 - 2⁵ = 66355481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66355517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4739673 + ... + 4739686.

It is an arithmetic number, because the mean of its divisors is an integer number (18958720).

Almost surely, 2^66355513 is an apocalyptic number.

It is an amenable number.

66355513 is a deficient number, since it is larger than the sum of its proper divisors (9479367).

66355513 is an equidigital number, since it uses as much as digits as its factorization.

66355513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9479366.

The product of its digits is 40500, while the sum is 34.

The square root of 66355513 is about 8145.8893314358. The cubic root of 66355513 is about 404.8483159045.

The spelling of 66355513 in words is "sixty-six million, three hundred fifty-five thousand, five hundred thirteen".