18929677968 has 100 divisors (see below), whose sum is σ = 54938646400. Its totient is φ = 6292541376.

The previous prime is 18929677957. The next prime is 18929677981. The reversal of 18929677968 is 86977692981.

18929677968 is a `hidden beast` number, since 189 + 296 + 77 + 96 + 8 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 18929677896 and 18929677905.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 455733 + ... + 495531.

It is an arithmetic number, because the mean of its divisors is an integer number (549386464).

Almost surely, 2^18929677968 is an apocalyptic number.

18929677968 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 18929677968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27469323200).

18929677968 is an abundant number, since it is smaller than the sum of its proper divisors (36008968432).

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

18929677968 is a wasteful number, since it uses less digits than its factorization.

18929677968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40186 (or 40171 counting only the distinct ones).

The product of its digits is 164602368, while the sum is 72.

The spelling of 18929677968 in words is "eighteen billion, nine hundred twenty-nine million, six hundred seventy-seven thousand, nine hundred sixty-eight".