84178406423 has 2 divisors, whose sum is σ = 84178406424. Its totient is φ = 84178406422.

The previous prime is 84178406359. The next prime is 84178406443. The reversal of 84178406423 is 32460487148.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84178406423 - 2⁶ = 84178406359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84178406443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42089203211 + 42089203212.

It is an arithmetic number, because the mean of its divisors is an integer number (42089203212).

Almost surely, 2^84178406423 is an apocalyptic number.

84178406423 is a deficient number, since it is larger than the sum of its proper divisors (1).

84178406423 is an equidigital number, since it uses as much as digits as its factorization.

84178406423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1032192, while the sum is 47.

The spelling of 84178406423 in words is "eighty-four billion, one hundred seventy-eight million, four hundred six thousand, four hundred twenty-three".