16203090661 has 2 divisors, whose sum is σ = 16203090662. Its totient is φ = 16203090660.

The previous prime is 16203090649. The next prime is 16203090667. The reversal of 16203090661 is 16609030261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14961937761 + 1241152900 = 122319^2 + 35230^2 .

It is an emirp because it is prime and its reverse (16609030261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16203090661 - 2¹¹ = 16203088613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16203090667) 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, 8101545330 + 8101545331.

It is an arithmetic number, because the mean of its divisors is an integer number (8101545331).

Almost surely, 2^16203090661 is an apocalyptic number.

It is an amenable number.

16203090661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16203090661 is an equidigital number, since it uses as much as digits as its factorization.

16203090661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 16203090661 in words is "sixteen billion, two hundred three million, ninety thousand, six hundred sixty-one".