84178406399 has 16 divisors (see below), whose sum is σ = 88914490560. Its totient is φ = 79533822720.

The previous prime is 84178406359. The next prime is 84178406423. The reversal of 84178406399 is 99360487148.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84178406399 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 (84178406329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2069849 + ... + 2110125.

It is an arithmetic number, because the mean of its divisors is an integer number (5557155660).

Almost surely, 2^84178406399 is an apocalyptic number.

84178406399 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

84178406399 is a deficient number, since it is larger than the sum of its proper divisors (4736084161).

84178406399 is a wasteful number, since it uses less digits than its factorization.

84178406399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41410.

The product of its (nonzero) digits is 10450944, while the sum is 59.

The spelling of 84178406399 in words is "eighty-four billion, one hundred seventy-eight million, four hundred six thousand, three hundred ninety-nine".