80351518921 has 2 divisors, whose sum is σ = 80351518922. Its totient is φ = 80351518920.

The previous prime is 80351518913. The next prime is 80351518927. The reversal of 80351518921 is 12981515308.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56453760000 + 23897758921 = 237600^2 + 154589^2 .

It is a cyclic number.

It is not a de Polignac number, because 80351518921 - 2³ = 80351518913 is a prime.

It is not a weakly prime, because it can be changed into another prime (80351518927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40175759460 + 40175759461.

It is an arithmetic number, because the mean of its divisors is an integer number (40175759461).

Almost surely, 2^80351518921 is an apocalyptic number.

It is an amenable number.

80351518921 is a deficient number, since it is larger than the sum of its proper divisors (1).

80351518921 is an equidigital number, since it uses as much as digits as its factorization.

80351518921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 43.

The spelling of 80351518921 in words is "eighty billion, three hundred fifty-one million, five hundred eighteen thousand, nine hundred twenty-one".