1318636991280 has 320 divisors, whose sum is σ = 4953288112128. Its totient is φ = 283286814720.

The previous prime is 1318636991279. The next prime is 1318636991303. The reversal of 1318636991280 is 821996368131.

It is a self number, because there is not a number n which added to its sum of digits gives 1318636991280.

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, 21189010 + ... + 21251150.

Almost surely, 2^{1318636991280} is an apocalyptic number.

1318636991280 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 1318636991280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2476644056064).

1318636991280 is an abundant number, since it is smaller than the sum of its proper divisors (3634651120848).

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

1318636991280 is a wasteful number, since it uses less digits than its factorization.

1318636991280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62924 (or 62918 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 57.

The spelling of 1318636991280 in words is "one trillion, three hundred eighteen billion, six hundred thirty-six million, nine hundred ninety-one thousand, two hundred eighty".