1681816382445 has 16 divisors (see below), whose sum is σ = 2692141191360. Its totient is φ = 896557077504.

The previous prime is 1681816382359. The next prime is 1681816382461. The reversal of 1681816382445 is 5442836181861.

It is not a de Polignac number, because 1681816382445 - 2⁷ = 1681816382317 is a prime.

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, 25694964 + ... + 25760333.

It is an arithmetic number, because the mean of its divisors is an integer number (168258824460).

Almost surely, 2^{1681816382445} is an apocalyptic number.

1681816382445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1681816382445 is a deficient number, since it is larger than the sum of its proper divisors (1010324808915).

1681816382445 is a wasteful number, since it uses less digits than its factorization.

1681816382445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51457484.

The product of its digits is 8847360, while the sum is 57.

The spelling of 1681816382445 in words is "one trillion, six hundred eighty-one billion, eight hundred sixteen million, three hundred eighty-two thousand, four hundred forty-five".