16631554609 has 2 divisors, whose sum is σ = 16631554610. Its totient is φ = 16631554608.

The previous prime is 16631554573. The next prime is 16631554717. The reversal of 16631554609 is 90645513661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13636400625 + 2995153984 = 116775^2 + 54728^2 .

It is an emirp because it is prime and its reverse (90645513661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16631554609 - 2⁷ = 16631554481 is a prime.

It is not a weakly prime, because it can be changed into another prime (16631554109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8315777304 + 8315777305.

It is an arithmetic number, because the mean of its divisors is an integer number (8315777305).

Almost surely, 2^16631554609 is an apocalyptic number.

It is an amenable number.

16631554609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16631554609 is an equidigital number, since it uses as much as digits as its factorization.

16631554609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 16631554609 in words is "sixteen billion, six hundred thirty-one million, five hundred fifty-four thousand, six hundred nine".