16442802661 has 2 divisors, whose sum is σ = 16442802662. Its totient is φ = 16442802660.

The previous prime is 16442802641. The next prime is 16442802703. The reversal of 16442802661 is 16620824461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8687358436 + 7755444225 = 93206^2 + 88065^2 .

It is a cyclic number.

It is not a de Polignac number, because 16442802661 - 2⁹ = 16442802149 is a prime.

It is a super-3 number, since 3×16442802661³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16442802641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221401330 + 8221401331.

It is an arithmetic number, because the mean of its divisors is an integer number (8221401331).

Almost surely, 2^16442802661 is an apocalyptic number.

It is an amenable number.

16442802661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16442802661 is an equidigital number, since it uses as much as digits as its factorization.

16442802661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 40.

The spelling of 16442802661 in words is "sixteen billion, four hundred forty-two million, eight hundred two thousand, six hundred sixty-one".