84178406401 has 4 divisors (see below), whose sum is σ = 87081110100. Its totient is φ = 81275702704.

The previous prime is 84178406359. The next prime is 84178406423. The reversal of 84178406401 is 10460487148.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65058154225 + 19120252176 = 255065^2 + 138276^2 .

It is a cyclic number.

It is not a de Polignac number, because 84178406401 - 2²¹ = 84176309249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84178406801) 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, 1451351806 + ... + 1451351863.

It is an arithmetic number, because the mean of its divisors is an integer number (21770277525).

Almost surely, 2^84178406401 is an apocalyptic number.

It is an amenable number.

84178406401 is a deficient number, since it is larger than the sum of its proper divisors (2902703699).

84178406401 is a wasteful number, since it uses less digits than its factorization.

84178406401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902703698.

The product of its (nonzero) digits is 172032, while the sum is 43.

The spelling of 84178406401 in words is "eighty-four billion, one hundred seventy-eight million, four hundred six thousand, four hundred one".