16663602097 has 6 divisors (see below), whose sum is σ = 17419607282. Its totient is φ = 15939097152.

The previous prime is 16663602083. The next prime is 16663602127. The reversal of 16663602097 is 79020636661.

It can be written as a sum of positive squares in only one way, i.e., 15753011121 + 910590976 = 125511^2 + 30176^2 .

It is not a de Polignac number, because 16663602097 - 2¹¹ = 16663600049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16663602017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15749568 + ... + 15750625.

Almost surely, 2^16663602097 is an apocalyptic number.

It is an amenable number.

16663602097 is a deficient number, since it is larger than the sum of its proper divisors (756005185).

16663602097 is an equidigital number, since it uses as much as digits as its factorization.

16663602097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31500239 (or 31500216 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 46.

The spelling of 16663602097 in words is "sixteen billion, six hundred sixty-three million, six hundred two thousand, ninety-seven".