1681242751728 has 80 divisors (see below), whose sum is σ = 4828191571200. Its totient is φ = 560135286720.

The previous prime is 1681242751717. The next prime is 1681242751751. The reversal of 1681242751728 is 8271572421861.

1681242751728 is a `hidden beast` number, since 1 + 6 + 81 + 2 + 4 + 27 + 517 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98868 + ... + 1836371.

It is an arithmetic number, because the mean of its divisors is an integer number (60352394640).

Almost surely, 2^{1681242751728} is an apocalyptic number.

1681242751728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1681242751728 is an abundant number, since it is smaller than the sum of its proper divisors (3146948819472).

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

1681242751728 is a wasteful number, since it uses less digits than its factorization.

1681242751728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937267 (or 1937255 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The spelling of 1681242751728 in words is "one trillion, six hundred eighty-one billion, two hundred forty-two million, seven hundred fifty-one thousand, seven hundred twenty-eight".