1281986396850 has 24 divisors (see below), whose sum is σ = 3179326264560. Its totient is φ = 341863039120.

The previous prime is 1281986396849. The next prime is 1281986396851. The reversal of 1281986396850 is 586936891821.

It is an interprime number because it is at equal distance from previous prime (1281986396849) and next prime (1281986396851).

It is not an unprimeable number, because it can be changed into a prime (1281986396851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4273287840 + ... + 4273288139.

It is an arithmetic number, because the mean of its divisors is an integer number (132471927690).

Almost surely, 2^{1281986396850} is an apocalyptic number.

1281986396850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1281986396850 is an abundant number, since it is smaller than the sum of its proper divisors (1897339867710).

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

1281986396850 is a wasteful number, since it uses less digits than its factorization.

1281986396850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8546575994 (or 8546575989 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 66.

The spelling of 1281986396850 in words is "one trillion, two hundred eighty-one billion, nine hundred eighty-six million, three hundred ninety-six thousand, eight hundred fifty".