66507513 has 8 divisors (see below), whose sum is σ = 92532288. Its totient is φ = 42410544.

The previous prime is 66507481. The next prime is 66507517. The reversal of 66507513 is 31570566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66507513 - 2⁵ = 66507481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66507517) 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, 481870 + ... + 482007.

It is an arithmetic number, because the mean of its divisors is an integer number (11566536).

Almost surely, 2^66507513 is an apocalyptic number.

It is an amenable number.

66507513 is a deficient number, since it is larger than the sum of its proper divisors (26024775).

66507513 is a wasteful number, since it uses less digits than its factorization.

66507513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963903.

The product of its (nonzero) digits is 18900, while the sum is 33.

The square root of 66507513 is about 8155.2138537257. The cubic root of 66507513 is about 405.1572076783.

The spelling of 66507513 in words is "sixty-six million, five hundred seven thousand, five hundred thirteen".