16931802661 has 2 divisors, whose sum is σ = 16931802662. Its totient is φ = 16931802660.

The previous prime is 16931802637. The next prime is 16931802683. The reversal of 16931802661 is 16620813961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15956489761 + 975312900 = 126319^2 + 31230^2 .

It is an emirp because it is prime and its reverse (16620813961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16931802661 - 2⁹ = 16931802149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16931802161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8465901330 + 8465901331.

It is an arithmetic number, because the mean of its divisors is an integer number (8465901331).

Almost surely, 2^16931802661 is an apocalyptic number.

It is an amenable number.

16931802661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16931802661 is an equidigital number, since it uses as much as digits as its factorization.

16931802661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 16931802661 in words is "sixteen billion, nine hundred thirty-one million, eight hundred two thousand, six hundred sixty-one".