80018174775661 has 2 divisors, whose sum is σ = 80018174775662. Its totient is φ = 80018174775660.

The previous prime is 80018174775641. The next prime is 80018174775743. The reversal of 80018174775661 is 16657747181008.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79802687565225 + 215487210436 = 8933235^2 + 464206^2 .

It is a cyclic number.

It is not a de Polignac number, because 80018174775661 - 2⁵ = 80018174775629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80018174775661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80018174775641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40009087387830 + 40009087387831.

It is an arithmetic number, because the mean of its divisors is an integer number (40009087387831).

Almost surely, 2^{80018174775661} is an apocalyptic number.

It is an amenable number.

80018174775661 is a deficient number, since it is larger than the sum of its proper divisors (1).

80018174775661 is an equidigital number, since it uses as much as digits as its factorization.

80018174775661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15805440, while the sum is 61.

The spelling of 80018174775661 in words is "eighty trillion, eighteen billion, one hundred seventy-four million, seven hundred seventy-five thousand, six hundred sixty-one".