80438780856541 has 2 divisors, whose sum is σ = 80438780856542. Its totient is φ = 80438780856540.

The previous prime is 80438780856293. The next prime is 80438780856557. The reversal of 80438780856541 is 14565808783408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72707239137316 + 7731541719225 = 8526854^2 + 2780565^2 .

It is a cyclic number.

It is not a de Polignac number, because 80438780856541 - 2¹⁵ = 80438780823773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80438780850541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40219390428270 + 40219390428271.

It is an arithmetic number, because the mean of its divisors is an integer number (40219390428271).

Almost surely, 2^{80438780856541} is an apocalyptic number.

It is an amenable number.

80438780856541 is a deficient number, since it is larger than the sum of its proper divisors (1).

80438780856541 is an equidigital number, since it uses as much as digits as its factorization.

80438780856541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 206438400, while the sum is 67.

The spelling of 80438780856541 in words is "eighty trillion, four hundred thirty-eight billion, seven hundred eighty million, eight hundred fifty-six thousand, five hundred forty-one".