18458679616 has 56 divisors (see below), whose sum is σ = 39645132800. Its totient is φ = 8476503552.

The previous prime is 18458679599. The next prime is 18458679637. The reversal of 18458679616 is 61697685481.

It is a happy number.

It is a super-2 number, since 2×18458679616² (a number of 21 digits) contains 22 as substring.

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, 109825 + ... + 221311.

It is an arithmetic number, because the mean of its divisors is an integer number (707948800).

Almost surely, 2^18458679616 is an apocalyptic number.

18458679616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18458679616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19822566400).

18458679616 is an abundant number, since it is smaller than the sum of its proper divisors (21186453184).

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

18458679616 is a wasteful number, since it uses less digits than its factorization.

18458679616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111711 (or 111701 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 61.

The spelling of 18458679616 in words is "eighteen billion, four hundred fifty-eight million, six hundred seventy-nine thousand, six hundred sixteen".