16663613 has 2 divisors, whose sum is σ = 16663614. Its totient is φ = 16663612.

The previous prime is 16663609. The next prime is 16663631. The reversal of 16663613 is 31636661.

Together with next prime (16663631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16467364 + 196249 = 4058^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 16663613 - 2² = 16663609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16663613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16663693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331806 + 8331807.

It is an arithmetic number, because the mean of its divisors is an integer number (8331807).

Almost surely, 2^16663613 is an apocalyptic number.

It is an amenable number.

16663613 is a deficient number, since it is larger than the sum of its proper divisors (1).

16663613 is an equidigital number, since it uses as much as digits as its factorization.

16663613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 32.

The square root of 16663613 is about 4082.1088912473. The cubic root of 16663613 is about 255.4208761545.

The spelling of 16663613 in words is "sixteen million, six hundred sixty-three thousand, six hundred thirteen".