8791100011978 has 8 divisors (see below), whose sum is σ = 13317210909540. Its totient is φ = 4352029708800.

The previous prime is 8791100011961. The next prime is 8791100012003.

It is a happy number.

8791100011978 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 5910893900289 + 2880206111689 = 2431233^2 + 1697117^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21760148343 + ... + 21760148746.

Almost surely, 2^{8791100011978} is an apocalyptic number.

8791100011978 is a deficient number, since it is larger than the sum of its proper divisors (4526110897562).

8791100011978 is a wasteful number, since it uses less digits than its factorization.

8791100011978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43520297192.

The product of its (nonzero) digits is 254016, while the sum is 52.

It can be divided in two parts, 87911000 and 11978, that added together give a palindrome (87922978).

The spelling of 8791100011978 in words is "eight trillion, seven hundred ninety-one billion, one hundred million, eleven thousand, nine hundred seventy-eight".