18426823617 has 16 divisors (see below), whose sum is σ = 26380743552. Its totient is φ = 11399082240.

The previous prime is 18426823603. The next prime is 18426823663. The reversal of 18426823617 is 71632862481.

It is not a de Polignac number, because 18426823617 - 2⁷ = 18426823489 is a prime.

It is a super-2 number, since 2×18426823617² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18426823117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2540818 + ... + 2548059.

It is an arithmetic number, because the mean of its divisors is an integer number (1648796472).

Almost surely, 2^18426823617 is an apocalyptic number.

18426823617 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18426823617 is a deficient number, since it is larger than the sum of its proper divisors (7953919935).

18426823617 is a wasteful number, since it uses less digits than its factorization.

18426823617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5088968.

The product of its digits is 774144, while the sum is 48.

The spelling of 18426823617 in words is "eighteen billion, four hundred twenty-six million, eight hundred twenty-three thousand, six hundred seventeen".