1378736665920 has 672 divisors, whose sum is σ = 5343927214080. Its totient is φ = 337065338880.

The previous prime is 1378736665909. The next prime is 1378736665961. The reversal of 1378736665920 is 295666378731.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 45785589 + ... + 45815691.

It is an arithmetic number, because the mean of its divisors is an integer number (7952272640).

Almost surely, 2^{1378736665920} is an apocalyptic number.

1378736665920 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 1378736665920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2671963607040).

1378736665920 is an abundant number, since it is smaller than the sum of its proper divisors (3965190548160).

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

1378736665920 is a wasteful number, since it uses less digits than its factorization.

1378736665920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30185 (or 30163 counting only the distinct ones).

The product of its (nonzero) digits is 68584320, while the sum is 63.

The spelling of 1378736665920 in words is "one trillion, three hundred seventy-eight billion, seven hundred thirty-six million, six hundred sixty-five thousand, nine hundred twenty".