16674847661 has 2 divisors, whose sum is σ = 16674847662. Its totient is φ = 16674847660.

The previous prime is 16674847543. The next prime is 16674847667.

16674847661 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15364842025 + 1310005636 = 123955^2 + 36194^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 16674847661 - 2³⁰ = 15601105837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16674847597 and 16674847606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16674847667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8337423830 + 8337423831.

It is an arithmetic number, because the mean of its divisors is an integer number (8337423831).

Almost surely, 2^16674847661 is an apocalyptic number.

It is an amenable number.

16674847661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16674847661 is an equidigital number, since it uses as much as digits as its factorization.

16674847661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8128512, while the sum is 56.

The spelling of 16674847661 in words is "sixteen billion, six hundred seventy-four million, eight hundred forty-seven thousand, six hundred sixty-one".