18971425536 has 576 divisors, whose sum is σ = 64381879296. Its totient is φ = 4836556800.

The previous prime is 18971425489. The next prime is 18971425541. The reversal of 18971425536 is 63552417981.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 228571351 + ... + 228571433.

It is an arithmetic number, because the mean of its divisors is an integer number (111774096).

Almost surely, 2^18971425536 is an apocalyptic number.

18971425536 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 18971425536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32190939648).

18971425536 is an abundant number, since it is smaller than the sum of its proper divisors (45410453760).

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

18971425536 is a wasteful number, since it uses less digits than its factorization.

18971425536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 214 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 51.

The spelling of 18971425536 in words is "eighteen billion, nine hundred seventy-one million, four hundred twenty-five thousand, five hundred thirty-six".