1685005617923 has 16 divisors (see below), whose sum is σ = 1802340249600. Its totient is φ = 1572567272640.

The previous prime is 1685005617899. The next prime is 1685005617931. The reversal of 1685005617923 is 3297165005861.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1685005617923 - 2¹² = 1685005613827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685005617983) 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, 7895138 + ... + 8105751.

It is an arithmetic number, because the mean of its divisors is an integer number (112646265600).

Almost surely, 2^{1685005617923} is an apocalyptic number.

1685005617923 is a deficient number, since it is larger than the sum of its proper divisors (117334631677).

1685005617923 is a wasteful number, since it uses less digits than its factorization.

1685005617923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16001042.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 1685005617923 in words is "one trillion, six hundred eighty-five billion, five million, six hundred seventeen thousand, nine hundred twenty-three".