80557144406821 has 4 divisors (see below), whose sum is σ = 84059628946272. Its totient is φ = 77054659867372.

The previous prime is 80557144406819. The next prime is 80557144406863. The reversal of 80557144406821 is 12860444175508.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80557144406821 - 2¹ = 80557144406819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80557144406881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751242269691 + ... + 1751242269736.

It is an arithmetic number, because the mean of its divisors is an integer number (21014907236568).

Almost surely, 2^{80557144406821} is an apocalyptic number.

It is an amenable number.

80557144406821 is a deficient number, since it is larger than the sum of its proper divisors (3502484539451).

80557144406821 is a wasteful number, since it uses less digits than its factorization.

80557144406821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3502484539450.

The product of its (nonzero) digits is 8601600, while the sum is 55.

The spelling of 80557144406821 in words is "eighty trillion, five hundred fifty-seven billion, one hundred forty-four million, four hundred six thousand, eight hundred twenty-one".