1287513908556 has 192 divisors, whose sum is σ = 3437570949120. Its totient is φ = 372553896960.

The previous prime is 1287513908543. The next prime is 1287513908591. The reversal of 1287513908556 is 6558093157821.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1287513908556.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34776351 + ... + 34813353.

It is an arithmetic number, because the mean of its divisors is an integer number (17904015360).

Almost surely, 2^{1287513908556} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287513908556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1718785474560).

1287513908556 is an abundant number, since it is smaller than the sum of its proper divisors (2150057040564).

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

1287513908556 is a wasteful number, since it uses less digits than its factorization.

1287513908556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37284 (or 37282 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 60.

The spelling of 1287513908556 in words is "one trillion, two hundred eighty-seven billion, five hundred thirteen million, nine hundred eight thousand, five hundred fifty-six".