66634513 has 4 divisors (see below), whose sum is σ = 72692208. Its totient is φ = 60576820.

The previous prime is 66634507. The next prime is 66634537. The reversal of 66634513 is 31543666.

66634513 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 66634513 - 2⁵ = 66634481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66634573) 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, 3028831 + ... + 3028852.

It is an arithmetic number, because the mean of its divisors is an integer number (18173052).

Almost surely, 2^66634513 is an apocalyptic number.

It is an amenable number.

66634513 is a deficient number, since it is larger than the sum of its proper divisors (6057695).

66634513 is a wasteful number, since it uses less digits than its factorization.

66634513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6057694.

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

The square root of 66634513 is about 8162.9965698878. The cubic root of 66634513 is about 405.4149341900.

The spelling of 66634513 in words is "sixty-six million, six hundred thirty-four thousand, five hundred thirteen".