878744738561668 has 24 divisors (see below), whose sum is σ = 1722944229418944. Its totient is φ = 388634036709600.

The previous prime is 878744738561639. The next prime is 878744738561681. The reversal of 878744738561668 is 866165837447878.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269884746088 + ... + 269884749343.

It is an arithmetic number, because the mean of its divisors is an integer number (71789342892456).

Almost surely, 2^{878744738561668} is an apocalyptic number.

It is an amenable number.

878744738561668 is a deficient number, since it is larger than the sum of its proper divisors (844199490857276).

878744738561668 is a wasteful number, since it uses less digits than its factorization.

878744738561668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539769495483 (or 539769495481 counting only the distinct ones).

The product of its digits is 72831467520, while the sum is 88.

The spelling of 878744738561668 in words is "eight hundred seventy-eight trillion, seven hundred forty-four billion, seven hundred thirty-eight million, five hundred sixty-one thousand, six hundred sixty-eight".