1491779386868 has 24 divisors (see below), whose sum is σ = 2749965187200. Its totient is φ = 706130777088.

The previous prime is 1491779386837. The next prime is 1491779386871. The reversal of 1491779386868 is 8686839771941.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6858380 + ... + 7072547.

It is an arithmetic number, because the mean of its divisors is an integer number (114581882800).

Almost surely, 2^{1491779386868} is an apocalyptic number.

It is an amenable number.

1491779386868 is a deficient number, since it is larger than the sum of its proper divisors (1258185800332).

1491779386868 is a wasteful number, since it uses less digits than its factorization.

1491779386868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13932359 (or 13932357 counting only the distinct ones).

The product of its digits is 877879296, while the sum is 77.

The spelling of 1491779386868 in words is "one trillion, four hundred ninety-one billion, seven hundred seventy-nine million, three hundred eighty-six thousand, eight hundred sixty-eight".