16661513 has 16 divisors (see below), whose sum is σ = 19414080. Its totient is φ = 14131200.

The previous prime is 16661509. The next prime is 16661527. The reversal of 16661513 is 31516661.

It is a cyclic number.

It is not a de Polignac number, because 16661513 - 2² = 16661509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16661563) 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 15 ways as a sum of consecutive naturals, for example, 25673 + ... + 26313.

It is an arithmetic number, because the mean of its divisors is an integer number (1213380).

Almost surely, 2^16661513 is an apocalyptic number.

It is an amenable number.

16661513 is a deficient number, since it is larger than the sum of its proper divisors (2752567).

16661513 is a wasteful number, since it uses less digits than its factorization.

16661513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808.

The product of its digits is 3240, while the sum is 29.

The square root of 16661513 is about 4081.8516631548. The cubic root of 16661513 is about 255.4101460611.

The spelling of 16661513 in words is "sixteen million, six hundred sixty-one thousand, five hundred thirteen".