80444340366421 has 2 divisors, whose sum is σ = 80444340366422. Its totient is φ = 80444340366420.

The previous prime is 80444340366323. The next prime is 80444340366427. The reversal of 80444340366421 is 12466304344408.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55656986250321 + 24787354116100 = 7460361^2 + 4978690^2 .

It is a cyclic number.

It is not a de Polignac number, because 80444340366421 - 2⁷ = 80444340366293 is a prime.

It is a super-2 number, since 2×80444340366421² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80444340366427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40222170183210 + 40222170183211.

It is an arithmetic number, because the mean of its divisors is an integer number (40222170183211).

Almost surely, 2^{80444340366421} is an apocalyptic number.

It is an amenable number.

80444340366421 is a deficient number, since it is larger than the sum of its proper divisors (1).

80444340366421 is an equidigital number, since it uses as much as digits as its factorization.

80444340366421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5308416, while the sum is 49.

The spelling of 80444340366421 in words is "eighty trillion, four hundred forty-four billion, three hundred forty million, three hundred sixty-six thousand, four hundred twenty-one".