9856171431678 has 64 divisors (see below), whose sum is σ = 23161000633344. Its totient is φ = 2756680080000.

The previous prime is 9856171431653. The next prime is 9856171431829. The reversal of 9856171431678 is 8761341716589.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7593388 + ... + 8796128.

It is an arithmetic number, because the mean of its divisors is an integer number (361890634896).

Almost surely, 2^{9856171431678} is an apocalyptic number.

9856171431678 is an abundant number, since it is smaller than the sum of its proper divisors (13304829201666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9856171431678 is a wasteful number, since it uses less digits than its factorization.

9856171431678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212321.

The product of its digits is 60963840, while the sum is 66.

The spelling of 9856171431678 in words is "nine trillion, eight hundred fifty-six billion, one hundred seventy-one million, four hundred thirty-one thousand, six hundred seventy-eight".