1681618161817 has 16 divisors (see below), whose sum is σ = 2044635652800. Its totient is φ = 1363090429440.

The previous prime is 1681618161803. The next prime is 1681618161827. The reversal of 1681618161817 is 7181618161861.

It is a cyclic number.

It is not a de Polignac number, because 1681618161817 - 2²⁷ = 1681483944089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681618161827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236644092 + ... + 236651197.

It is an arithmetic number, because the mean of its divisors is an integer number (127789728300).

Almost surely, 2^{1681618161817} is an apocalyptic number.

1681618161817 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1681618161817 is a deficient number, since it is larger than the sum of its proper divisors (363017490983).

1681618161817 is a wasteful number, since it uses less digits than its factorization.

1681618161817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473295336.

The product of its digits is 774144, while the sum is 55.

The spelling of 1681618161817 in words is "one trillion, six hundred eighty-one billion, six hundred eighteen million, one hundred sixty-one thousand, eight hundred seventeen".