1381320161584 has 480 divisors, whose sum is σ = 3429470499840. Its totient is φ = 534693519360.

The previous prime is 1381320161563. The next prime is 1381320161653. The reversal of 1381320161584 is 4851610231831.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 1381320161584.

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, 1263787342 + ... + 1263788434.

It is an arithmetic number, because the mean of its divisors is an integer number (7144730208).

Almost surely, 2^{1381320161584} 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 1381320161584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1714735249920).

1381320161584 is an abundant number, since it is smaller than the sum of its proper divisors (2048150338256).

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

1381320161584 is a wasteful number, since it uses less digits than its factorization.

1381320161584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249 (or 1232 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 1381320161584 in words is "one trillion, three hundred eighty-one billion, three hundred twenty million, one hundred sixty-one thousand, five hundred eighty-four".