80663036621 has 2 divisors, whose sum is σ = 80663036622. Its totient is φ = 80663036620.

The previous prime is 80663036567. The next prime is 80663036651. The reversal of 80663036621 is 12663036608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62115592900 + 18547443721 = 249230^2 + 136189^2 .

It is a cyclic number.

It is not a de Polignac number, because 80663036621 - 2⁶ = 80663036557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80663036651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40331518310 + 40331518311.

It is an arithmetic number, because the mean of its divisors is an integer number (40331518311).

Almost surely, 2^80663036621 is an apocalyptic number.

It is an amenable number.

80663036621 is a deficient number, since it is larger than the sum of its proper divisors (1).

80663036621 is an equidigital number, since it uses as much as digits as its factorization.

80663036621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 80663036621 in words is "eighty billion, six hundred sixty-three million, thirty-six thousand, six hundred twenty-one".