1258686991866 has 16 divisors (see below), whose sum is σ = 2526663189888. Its totient is φ = 418014129600.

The previous prime is 1258686991853. The next prime is 1258686991883. The reversal of 1258686991866 is 6681996868521.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387048495 + ... + 387051746.

It is an arithmetic number, because the mean of its divisors is an integer number (157916449368).

Almost surely, 2^{1258686991866} is an apocalyptic number.

1258686991866 is an abundant number, since it is smaller than the sum of its proper divisors (1267976198022).

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

1258686991866 is a wasteful number, since it uses less digits than its factorization.

1258686991866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774100517.

The product of its digits is 537477120, while the sum is 75.

The spelling of 1258686991866 in words is "one trillion, two hundred fifty-eight billion, six hundred eighty-six million, nine hundred ninety-one thousand, eight hundred sixty-six".