1581720872084 has 12 divisors (see below), whose sum is σ = 2768041393908. Its totient is φ = 790851902400.

The previous prime is 1581720872041. The next prime is 1581720872141. The reversal of 1581720872084 is 4802780271851.

It can be written as a sum of positive squares in 2 ways, for example, as 890528167684 + 691192704400 = 943678^2 + 831380^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1706897 + ... + 2465144.

It is an arithmetic number, because the mean of its divisors is an integer number (230670116159).

Almost surely, 2^{1581720872084} is an apocalyptic number.

It is an amenable number.

1581720872084 is a deficient number, since it is larger than the sum of its proper divisors (1186320521824).

1581720872084 is a wasteful number, since it uses less digits than its factorization.

1581720872084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266826 (or 4266824 counting only the distinct ones).

The product of its (nonzero) digits is 2007040, while the sum is 53.

The spelling of 1581720872084 in words is "one trillion, five hundred eighty-one billion, seven hundred twenty million, eight hundred seventy-two thousand, eighty-four".