17975421808 has 40 divisors (see below), whose sum is σ = 36728499920. Its totient is φ = 8498856960.

The previous prime is 17975421769. The next prime is 17975421823. The reversal of 17975421808 is 80812457971.

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, 109816 + ... + 219112.

It is an arithmetic number, because the mean of its divisors is an integer number (918212498).

Almost surely, 2^17975421808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17975421808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18364249960).

17975421808 is an abundant number, since it is smaller than the sum of its proper divisors (18753078112).

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

17975421808 is a wasteful number, since it uses less digits than its factorization.

17975421808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109865 (or 109859 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 17975421808 in words is "seventeen billion, nine hundred seventy-five million, four hundred twenty-one thousand, eight hundred eight".