3978818181877 has 64 divisors (see below), whose sum is σ = 5061827635200. Its totient is φ = 3037492442880.

The previous prime is 3978818181839. The next prime is 3978818181901. The reversal of 3978818181877 is 7781818188793.

It is not a de Polignac number, because 3978818181877 - 2⁷ = 3978818181749 is a prime.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978818181827) 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 63 ways as a sum of consecutive naturals, for example, 2328154899 + ... + 2328156607.

It is an arithmetic number, because the mean of its divisors is an integer number (79091056800).

Almost surely, 2^{3978818181877} is an apocalyptic number.

It is an amenable number.

3978818181877 is a deficient number, since it is larger than the sum of its proper divisors (1083009453323).

3978818181877 is a wasteful number, since it uses less digits than its factorization.

3978818181877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226.

The product of its digits is 303464448, while the sum is 76.

It can be divided in two parts, 397881 and 8181877, that added together give a palindrome (8579758).

The spelling of 3978818181877 in words is "three trillion, nine hundred seventy-eight billion, eight hundred eighteen million, one hundred eighty-one thousand, eight hundred seventy-seven".