18938256117780 has 96 divisors (see below), whose sum is σ = 54463560520320. Its totient is φ = 4913413931520.

The previous prime is 18938256117763. The next prime is 18938256117811. The reversal of 18938256117780 is 8771165283981.

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, 37911435 + ... + 38407725.

It is an arithmetic number, because the mean of its divisors is an integer number (567328755420).

Almost surely, 2^{18938256117780} is an apocalyptic number.

18938256117780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18938256117780 is an abundant number, since it is smaller than the sum of its proper divisors (35525304402540).

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

18938256117780 is a wasteful number, since it uses less digits than its factorization.

18938256117780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513529 (or 513527 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 66.

The spelling of 18938256117780 in words is "eighteen trillion, nine hundred thirty-eight billion, two hundred fifty-six million, one hundred seventeen thousand, seven hundred eighty".