80185642664437 has 2 divisors, whose sum is σ = 80185642664438. Its totient is φ = 80185642664436.

The previous prime is 80185642664429. The next prime is 80185642664443. The reversal of 80185642664437 is 73446624658108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75736099617201 + 4449543047236 = 8702649^2 + 2109394^2 .

It is a cyclic number.

It is not a de Polignac number, because 80185642664437 - 2³ = 80185642664429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80185642661437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40092821332218 + 40092821332219.

It is an arithmetic number, because the mean of its divisors is an integer number (40092821332219).

Almost surely, 2^{80185642664437} is an apocalyptic number.

It is an amenable number.

80185642664437 is a deficient number, since it is larger than the sum of its proper divisors (1).

80185642664437 is an equidigital number, since it uses as much as digits as its factorization.

80185642664437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185794560, while the sum is 64.

The spelling of 80185642664437 in words is "eighty trillion, one hundred eighty-five billion, six hundred forty-two million, six hundred sixty-four thousand, four hundred thirty-seven".