3891673241856 has 216 divisors, whose sum is σ = 11581873867200. Its totient is φ = 1255816286208.

The previous prime is 3891673241791. The next prime is 3891673241857. The reversal of 3891673241856 is 6581423761983.

3891673241856 is a `hidden beast` number, since 3 + 8 + 9 + 167 + 3 + 2 + 418 + 56 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 3891673241793 and 3891673241802.

It is not an unprimeable number, because it can be changed into a prime (3891673241857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16849651 + ... + 17079053.

Almost surely, 2^{3891673241856} is an apocalyptic number.

3891673241856 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3891673241856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5790936933600).

3891673241856 is an abundant number, since it is smaller than the sum of its proper divisors (7690200625344).

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

3891673241856 is a wasteful number, since it uses less digits than its factorization.

3891673241856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229661 (or 229644 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The spelling of 3891673241856 in words is "three trillion, eight hundred ninety-one billion, six hundred seventy-three million, two hundred forty-one thousand, eight hundred fifty-six".