3981978180216 has 48 divisors (see below), whose sum is σ = 10784797803000. Its totient is φ = 1327292390592.

The previous prime is 3981978180211. The next prime is 3981978180239. The reversal of 3981978180216 is 6120818791893.

3981978180216 is a `hidden beast` number, since 398 + 1 + 97 + 81 + 80 + 2 + 1 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981978180211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2241835 + ... + 3604133.

Almost surely, 2^{3981978180216} is an apocalyptic number.

3981978180216 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3981978180216 is an abundant number, since it is smaller than the sum of its proper divisors (6802819622784).

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

3981978180216 is a wasteful number, since it uses less digits than its factorization.

3981978180216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402908 (or 1402901 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 3981978180216 in words is "three trillion, nine hundred eighty-one billion, nine hundred seventy-eight million, one hundred eighty thousand, two hundred sixteen".