1286998105520 has 80 divisors (see below), whose sum is σ = 3089952611328. Its totient is φ = 498006178560.

The previous prime is 1286998105507. The next prime is 1286998105529. The reversal of 1286998105520 is 255018996821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1286998105520² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1286998105529) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6617507 + ... + 6809213.

Almost surely, 2^{1286998105520} is an apocalyptic number.

1286998105520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1286998105520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1544976305664).

1286998105520 is an abundant number, since it is smaller than the sum of its proper divisors (1802954505808).

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

1286998105520 is a wasteful number, since it uses less digits than its factorization.

1286998105520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194458 (or 194452 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 56.

The spelling of 1286998105520 in words is "one trillion, two hundred eighty-six billion, nine hundred ninety-eight million, one hundred five thousand, five hundred twenty".