1261378022878 has 16 divisors (see below), whose sum is σ = 1932486441984. Its totient is φ = 617218134840.

The previous prime is 1261378022803. The next prime is 1261378022887. The reversal of 1261378022878 is 8782208731621.

It is a super-2 number, since 2×1261378022878² (a number of 25 digits) contains 22 as substring.

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, 569863 + ... + 1687453.

It is an arithmetic number, because the mean of its divisors is an integer number (120780402624).

Almost surely, 2^{1261378022878} is an apocalyptic number.

1261378022878 is a deficient number, since it is larger than the sum of its proper divisors (671108419106).

1261378022878 is a wasteful number, since it uses less digits than its factorization.

1261378022878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129647.

The product of its (nonzero) digits is 3612672, while the sum is 55.

The spelling of 1261378022878 in words is "one trillion, two hundred sixty-one billion, three hundred seventy-eight million, twenty-two thousand, eight hundred seventy-eight".