66736513 has 4 divisors (see below), whose sum is σ = 66990528. Its totient is φ = 66482500.

The previous prime is 66736507. The next prime is 66736529. The reversal of 66736513 is 31563766.

66736513 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 a cyclic number.

It is not a de Polignac number, because 66736513 - 2⁹ = 66736001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66736213) 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, 126613 + ... + 127138.

It is an arithmetic number, because the mean of its divisors is an integer number (16747632).

Almost surely, 2^66736513 is an apocalyptic number.

It is an amenable number.

66736513 is a deficient number, since it is larger than the sum of its proper divisors (254015).

66736513 is a wasteful number, since it uses less digits than its factorization.

66736513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254014.

The product of its digits is 68040, while the sum is 37.

The square root of 66736513 is about 8169.2418864911. The cubic root of 66736513 is about 405.6216901162.

The spelling of 66736513 in words is "sixty-six million, seven hundred thirty-six thousand, five hundred thirteen".