80219011661 has 2 divisors, whose sum is σ = 80219011662. Its totient is φ = 80219011660.

The previous prime is 80219011651. The next prime is 80219011679. The reversal of 80219011661 is 16611091208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48068370025 + 32150641636 = 219245^2 + 179306^2 .

It is a cyclic number.

It is not a de Polignac number, because 80219011661 - 2⁶ = 80219011597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80219011651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40109505830 + 40109505831.

It is an arithmetic number, because the mean of its divisors is an integer number (40109505831).

Almost surely, 2^80219011661 is an apocalyptic number.

It is an amenable number.

80219011661 is a deficient number, since it is larger than the sum of its proper divisors (1).

80219011661 is an equidigital number, since it uses as much as digits as its factorization.

80219011661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 80219011661 in words is "eighty billion, two hundred nineteen million, eleven thousand, six hundred sixty-one".