66198513 has 16 divisors (see below), whose sum is σ = 92586240. Its totient is φ = 42022656.

The previous prime is 66198497. The next prime is 66198521. The reversal of 66198513 is 31589166.

It is not a de Polignac number, because 66198513 - 2⁴ = 66198497 is a prime.

It is a super-2 number, since 2×66198513² = 8764486246822338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66198533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1128 + ... + 11561.

It is an arithmetic number, because the mean of its divisors is an integer number (5786640).

Almost surely, 2^66198513 is an apocalyptic number.

It is an amenable number.

66198513 is a deficient number, since it is larger than the sum of its proper divisors (26387727).

66198513 is a wasteful number, since it uses less digits than its factorization.

66198513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12776.

The product of its digits is 38880, while the sum is 39.

The square root of 66198513 is about 8136.2468620366. The cubic root of 66198513 is about 404.5287675695.

The spelling of 66198513 in words is "sixty-six million, one hundred ninety-eight thousand, five hundred thirteen".