80439472676921 has 2 divisors, whose sum is σ = 80439472676922. Its totient is φ = 80439472676920.

The previous prime is 80439472676887. The next prime is 80439472676963. The reversal of 80439472676921 is 12967627493408.

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., 69566625916921 + 10872846760000 = 8340661^2 + 3297400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80439472676921 is a prime.

It is a super-2 number, since 2×80439472676921² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80439472676971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40219736338460 + 40219736338461.

It is an arithmetic number, because the mean of its divisors is an integer number (40219736338461).

Almost surely, 2^{80439472676921} is an apocalyptic number.

It is an amenable number.

80439472676921 is a deficient number, since it is larger than the sum of its proper divisors (1).

80439472676921 is an equidigital number, since it uses as much as digits as its factorization.

80439472676921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 219469824, while the sum is 68.

The spelling of 80439472676921 in words is "eighty trillion, four hundred thirty-nine billion, four hundred seventy-two million, six hundred seventy-six thousand, nine hundred twenty-one".