1278950557026 has 16 divisors (see below), whose sum is σ = 2557923486624. Its totient is φ = 426313123584.

The previous prime is 1278950556991. The next prime is 1278950557069. The reversal of 1278950557026 is 6207550598721.

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, 136831 + ... + 1605186.

It is an arithmetic number, because the mean of its divisors is an integer number (159870217914).

Almost surely, 2^{1278950557026} is an apocalyptic number.

1278950557026 is an abundant number, since it is smaller than the sum of its proper divisors (1278972929598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278950557026 is a wasteful number, since it uses less digits than its factorization.

1278950557026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864385.

The product of its (nonzero) digits is 10584000, while the sum is 57.

The spelling of 1278950557026 in words is "one trillion, two hundred seventy-eight billion, nine hundred fifty million, five hundred fifty-seven thousand, twenty-six".