18971971160 has 64 divisors (see below), whose sum is σ = 43592683680. Its totient is φ = 7428428800.

The previous prime is 18971971159. The next prime is 18971971163. The reversal of 18971971160 is 6117917981.

It is a junction number, because it is equal to n+sod(n) for n = 18971971099 and 18971971108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18971971163) 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, 929060 + ... + 949260.

Almost surely, 2^18971971160 is an apocalyptic number.

18971971160 is a gapful number since it is divisible by the number (10) 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 18971971160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21796341840).

18971971160 is an abundant number, since it is smaller than the sum of its proper divisors (24620712520).

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

18971971160 is a wasteful number, since it uses less digits than its factorization.

18971971160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20708 (or 20704 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 50.

The spelling of 18971971160 in words is "eighteen billion, nine hundred seventy-one million, nine hundred seventy-one thousand, one hundred sixty".