878815043354721 has 48 divisors (see below), whose sum is σ = 1356080630829120. Its totient is φ = 504458899084800.

The previous prime is 878815043354707. The next prime is 878815043354723. The reversal of 878815043354721 is 127453340518878.

It is not a de Polignac number, because 878815043354721 - 2⁷ = 878815043354593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (878815043354723) 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 47 ways as a sum of consecutive naturals, for example, 12449461 + ... + 43733501.

It is an arithmetic number, because the mean of its divisors is an integer number (28251679808940).

Almost surely, 2^{878815043354721} is an apocalyptic number.

It is an amenable number.

878815043354721 is a deficient number, since it is larger than the sum of its proper divisors (477265587474399).

878815043354721 is a wasteful number, since it uses less digits than its factorization.

878815043354721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31288158 (or 31288147 counting only the distinct ones).

The product of its (nonzero) digits is 180633600, while the sum is 66.

The spelling of 878815043354721 in words is "eight hundred seventy-eight trillion, eight hundred fifteen billion, forty-three million, three hundred fifty-four thousand, seven hundred twenty-one".