1278339366720 has 448 divisors, whose sum is σ = 4412457536256. Its totient is φ = 311692492800.

The previous prime is 1278339366677. The next prime is 1278339366793. The reversal of 1278339366720 is 276639338721.

It is a congruent number.

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, 785702547 + ... + 785704173.

It is an arithmetic number, because the mean of its divisors is an integer number (9849235572).

Almost surely, 2^{1278339366720} is an apocalyptic number.

1278339366720 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 1278339366720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2206228768128).

1278339366720 is an abundant number, since it is smaller than the sum of its proper divisors (3134118169536).

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

1278339366720 is a wasteful number, since it uses less digits than its factorization.

1278339366720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218 (or 2208 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 57.

The spelling of 1278339366720 in words is "one trillion, two hundred seventy-eight billion, three hundred thirty-nine million, three hundred sixty-six thousand, seven hundred twenty".