891248538818 has 16 divisors (see below), whose sum is σ = 1458680360256. Its totient is φ = 405036955440.

The previous prime is 891248538743. The next prime is 891248538841. The reversal of 891248538818 is 818835842198.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3680846 + ... + 3915497.

It is an arithmetic number, because the mean of its divisors is an integer number (91167522516).

Almost surely, 2^891248538818 is an apocalyptic number.

891248538818 is a deficient number, since it is larger than the sum of its proper divisors (567431821438).

891248538818 is a wasteful number, since it uses less digits than its factorization.

891248538818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7601689.

The product of its digits is 35389440, while the sum is 65.

The spelling of 891248538818 in words is "eight hundred ninety-one billion, two hundred forty-eight million, five hundred thirty-eight thousand, eight hundred eighteen".