18109897855 has 8 divisors (see below), whose sum is σ = 24836431392. Its totient is φ = 12418215648.

The previous prime is 18109897837. The next prime is 18109897933. The reversal of 18109897855 is 55879890181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18109897855 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18109897793 and 18109897802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258712792 + ... + 258712861.

It is an arithmetic number, because the mean of its divisors is an integer number (3104553924).

Almost surely, 2^18109897855 is an apocalyptic number.

18109897855 is a deficient number, since it is larger than the sum of its proper divisors (6726533537).

18109897855 is an equidigital number, since it uses as much as digits as its factorization.

18109897855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517425665.

The product of its (nonzero) digits is 7257600, while the sum is 61.

The spelling of 18109897855 in words is "eighteen billion, one hundred nine million, eight hundred ninety-seven thousand, eight hundred fifty-five".