66513513 has 24 divisors (see below), whose sum is σ = 98431200. Its totient is φ = 39621120.

The previous prime is 66513511. The next prime is 66513533. The reversal of 66513513 is 31531566.

It is not a de Polignac number, because 66513513 - 2¹ = 66513511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66513511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147913 + ... + 148361.

It is an arithmetic number, because the mean of its divisors is an integer number (4101300).

Almost surely, 2^66513513 is an apocalyptic number.

It is an amenable number.

66513513 is a deficient number, since it is larger than the sum of its proper divisors (31917687).

66513513 is a wasteful number, since it uses less digits than its factorization.

66513513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597 (or 530 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

The square root of 66513513 is about 8155.5817082536. The cubic root of 66513513 is about 405.1693911146.

The spelling of 66513513 in words is "sixty-six million, five hundred thirteen thousand, five hundred thirteen".