18877733072856 has 192 divisors, whose sum is σ = 58764933427200. Its totient is φ = 5362906765824.

The previous prime is 18877733072753. The next prime is 18877733072867. The reversal of 18877733072856 is 65827033777881.

18877733072856 is a `hidden beast` number, since 1 + 8 + 8 + 7 + 7 + 7 + 330 + 7 + 285 + 6 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63134601 + ... + 63432903.

It is an arithmetic number, because the mean of its divisors is an integer number (306067361600).

Almost surely, 2^{18877733072856} 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 18877733072856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29382466713600).

18877733072856 is an abundant number, since it is smaller than the sum of its proper divisors (39887200354344).

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

18877733072856 is a wasteful number, since it uses less digits than its factorization.

18877733072856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299038 (or 299031 counting only the distinct ones).

The product of its (nonzero) digits is 663828480, while the sum is 72.

The spelling of 18877733072856 in words is "eighteen trillion, eight hundred seventy-seven billion, seven hundred thirty-three million, seventy-two thousand, eight hundred fifty-six".