18545578849536 has 288 divisors, whose sum is σ = 52507344691200. Its totient is φ = 5794676858880.

The previous prime is 18545578849493. The next prime is 18545578849541. The reversal of 18545578849536 is 63594887554581.

It is a Smith number, since the sum of its digits (78) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 547518681 + ... + 547552551.

Almost surely, 2^{18545578849536} is an apocalyptic number.

18545578849536 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 18545578849536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26253672345600).

18545578849536 is an abundant number, since it is smaller than the sum of its proper divisors (33961765841664).

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

18545578849536 is a wasteful number, since it uses less digits than its factorization.

18545578849536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34305 (or 34291 counting only the distinct ones).

The product of its digits is 5806080000, while the sum is 78.

The spelling of 18545578849536 in words is "eighteen trillion, five hundred forty-five billion, five hundred seventy-eight million, eight hundred forty-nine thousand, five hundred thirty-six".