1298668135856 has 120 divisors (see below), whose sum is σ = 3164395903200. Its totient is φ = 511758729216.

The previous prime is 1298668135837. The next prime is 1298668135889. The reversal of 1298668135856 is 6585318668921.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2371445 + ... + 2867243.

It is an arithmetic number, because the mean of its divisors is an integer number (26369965860).

Almost surely, 2^{1298668135856} is an apocalyptic number.

1298668135856 is a gapful number since it is divisible by the number (16) 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 1298668135856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1582197951600).

1298668135856 is an abundant number, since it is smaller than the sum of its proper divisors (1865727767344).

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

1298668135856 is a wasteful number, since it uses less digits than its factorization.

1298668135856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496091 (or 496078 counting only the distinct ones).

The product of its digits is 149299200, while the sum is 68.

The spelling of 1298668135856 in words is "one trillion, two hundred ninety-eight billion, six hundred sixty-eight million, one hundred thirty-five thousand, eight hundred fifty-six".