3978310805845 has 8 divisors (see below), whose sum is σ = 5025234702240. Its totient is φ = 3015140821200.

The previous prime is 3978310805789. The next prime is 3978310805863. The reversal of 3978310805845 is 5485080138793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-3978310805845 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20938477831 + ... + 20938478020.

It is an arithmetic number, because the mean of its divisors is an integer number (628154337780).

Almost surely, 2^{3978310805845} is an apocalyptic number.

It is an amenable number.

3978310805845 is a deficient number, since it is larger than the sum of its proper divisors (1046923896395).

3978310805845 is a wasteful number, since it uses less digits than its factorization.

3978310805845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41876955875.

The product of its (nonzero) digits is 29030400, while the sum is 61.

The spelling of 3978310805845 in words is "three trillion, nine hundred seventy-eight billion, three hundred ten million, eight hundred five thousand, eight hundred forty-five".