1278849169779 has 16 divisors (see below), whose sum is σ = 1794965673600. Its totient is φ = 807653871936.

The previous prime is 1278849169753. The next prime is 1278849169783. The reversal of 1278849169779 is 9779619488721.

It is not a de Polignac number, because 1278849169779 - 2¹⁶ = 1278849104243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278849169789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 612312 + ... + 1712490.

It is an arithmetic number, because the mean of its divisors is an integer number (112185354600).

Almost surely, 2^{1278849169779} is an apocalyptic number.

1278849169779 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1278849169779 is a deficient number, since it is larger than the sum of its proper divisors (516116503821).

1278849169779 is a wasteful number, since it uses less digits than its factorization.

1278849169779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120594.

The product of its digits is 768144384, while the sum is 78.

The spelling of 1278849169779 in words is "one trillion, two hundred seventy-eight billion, eight hundred forty-nine million, one hundred sixty-nine thousand, seven hundred seventy-nine".