18109647654 has 96 divisors (see below), whose sum is σ = 42503584896. Its totient is φ = 5128865280.

The previous prime is 18109647653. The next prime is 18109647727. The reversal of 18109647654 is 45674690181.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18109647597 and 18109647606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109647653) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21897589 + ... + 21898415.

It is an arithmetic number, because the mean of its divisors is an integer number (442745676).

Almost surely, 2^18109647654 is an apocalyptic number.

18109647654 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18109647654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21251792448).

18109647654 is an abundant number, since it is smaller than the sum of its proper divisors (24393937242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18109647654 is a wasteful number, since it uses less digits than its factorization.

18109647654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410 (or 1403 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 18109647654 in words is "eighteen billion, one hundred nine million, six hundred forty-seven thousand, six hundred fifty-four".