3978747863985 has 16 divisors (see below), whose sum is σ = 6701049034560. Its totient is φ = 2010314710080.

The previous prime is 3978747863963. The next prime is 3978747864019. The reversal of 3978747863985 is 5893687478793.

3978747863985 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3978747863985 - 2¹³ = 3978747855793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3978747863898 and 3978747863907.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6980259126 + ... + 6980259695.

It is an arithmetic number, because the mean of its divisors is an integer number (418815564660).

Almost surely, 2^{3978747863985} is an apocalyptic number.

It is an amenable number.

3978747863985 is a deficient number, since it is larger than the sum of its proper divisors (2722301170575).

3978747863985 is a wasteful number, since it uses less digits than its factorization.

3978747863985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13960518848.

The product of its digits is 15362887680, while the sum is 84.

The spelling of 3978747863985 in words is "three trillion, nine hundred seventy-eight billion, seven hundred forty-seven million, eight hundred sixty-three thousand, nine hundred eighty-five".