391378855521002 has 16 divisors (see below), whose sum is σ = 612917286246720. Its totient is φ = 187082101633152.

The previous prime is 391378855520951. The next prime is 391378855521083. The reversal of 391378855521002 is 200125558873193.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2251960748 + ... + 2252134535.

It is an arithmetic number, because the mean of its divisors is an integer number (38307330390420).

Almost surely, 2^{391378855521002} is an apocalyptic number.

391378855521002 is a deficient number, since it is larger than the sum of its proper divisors (221538430725718).

391378855521002 is a wasteful number, since it uses less digits than its factorization.

391378855521002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504097197.

The product of its (nonzero) digits is 18144000, while the sum is 59.

The spelling of 391378855521002 in words is "three hundred ninety-one trillion, three hundred seventy-eight billion, eight hundred fifty-five million, five hundred twenty-one thousand, two".