1381865870880 has 960 divisors, whose sum is σ = 5568192419328. Its totient is φ = 319729213440.

The previous prime is 1381865870873. The next prime is 1381865870881. The reversal of 1381865870880 is 880785681831.

1381865870880 is a `hidden beast` number, since 1 + 38 + 18 + 6 + 587 + 0 + 8 + 8 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (1381865870881) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 279557689 + ... + 279562631.

Almost surely, 2^{1381865870880} is an apocalyptic number.

1381865870880 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 1381865870880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2784096209664).

1381865870880 is an abundant number, since it is smaller than the sum of its proper divisors (4186326548448).

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

1381865870880 is a wasteful number, since it uses less digits than its factorization.

1381865870880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5071 (or 5054 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 63.

The spelling of 1381865870880 in words is "one trillion, three hundred eighty-one billion, eight hundred sixty-five million, eight hundred seventy thousand, eight hundred eighty".