18929299968 has 160 divisors (see below), whose sum is σ = 56744582400. Its totient is φ = 6229536768.

The previous prime is 18929299957. The next prime is 18929299969. The reversal of 18929299968 is 86999292981.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 18929299896 and 18929299905.

It is not an unprimeable number, because it can be changed into a prime (18929299969) 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, 1083430 + ... + 1100762.

It is an arithmetic number, because the mean of its divisors is an integer number (354653640).

Almost surely, 2^18929299968 is an apocalyptic number.

18929299968 is a gapful number since it is divisible by the number (18) 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 18929299968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28372291200).

18929299968 is an abundant number, since it is smaller than the sum of its proper divisors (37815282432).

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

18929299968 is an equidigital number, since it uses as much as digits as its factorization.

18929299968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17439 (or 17417 counting only the distinct ones).

The product of its digits is 90699264, while the sum is 72.

The spelling of 18929299968 in words is "eighteen billion, nine hundred twenty-nine million, two hundred ninety-nine thousand, nine hundred sixty-eight".