84178555428223 has 2 divisors, whose sum is σ = 84178555428224. Its totient is φ = 84178555428222.

The previous prime is 84178555428193. The next prime is 84178555428229. The reversal of 84178555428223 is 32282455587148.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84178555428223 - 2²¹ = 84178553331071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84178555428229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42089277714111 + 42089277714112.

It is an arithmetic number, because the mean of its divisors is an integer number (42089277714112).

Almost surely, 2^{84178555428223} is an apocalyptic number.

84178555428223 is a deficient number, since it is larger than the sum of its proper divisors (1).

84178555428223 is an equidigital number, since it uses as much as digits as its factorization.

84178555428223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032000, while the sum is 64.

The spelling of 84178555428223 in words is "eighty-four trillion, one hundred seventy-eight billion, five hundred fifty-five million, four hundred twenty-eight thousand, two hundred twenty-three".