6663855363879 has 32 divisors (see below), whose sum is σ = 10255437734400. Its totient is φ = 3770048880000.

The previous prime is 6663855363853. The next prime is 6663855363887. The reversal of 6663855363879 is 9783635583666.

It is not a de Polignac number, because 6663855363879 - 2⁷ = 6663855363751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6663855363879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663855361879) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60497404 + ... + 60607454.

It is an arithmetic number, because the mean of its divisors is an integer number (320482429200).

Almost surely, 2^{6663855363879} is an apocalyptic number.

6663855363879 is a deficient number, since it is larger than the sum of its proper divisors (3591582370521).

6663855363879 is a wasteful number, since it uses less digits than its factorization.

6663855363879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138711.

The product of its digits is 3527193600, while the sum is 75.

The spelling of 6663855363879 in words is "six trillion, six hundred sixty-three billion, eight hundred fifty-five million, three hundred sixty-three thousand, eight hundred seventy-nine".