18685351868536 has 32 divisors (see below), whose sum is σ = 37096577238240. Its totient is φ = 8792950770688.

The previous prime is 18685351868531. The next prime is 18685351868539. The reversal of 18685351868536 is 63586815358681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18685351868531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6662421 + ... + 9042043.

It is an arithmetic number, because the mean of its divisors is an integer number (1159268038695).

Almost surely, 2^{18685351868536} is an apocalyptic number.

It is an amenable number.

18685351868536 is a deficient number, since it is larger than the sum of its proper divisors (18411225369704).

18685351868536 is a wasteful number, since it uses less digits than its factorization.

18685351868536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437383 (or 2437379 counting only the distinct ones).

The product of its digits is 995328000, while the sum is 73.

The spelling of 18685351868536 in words is "eighteen trillion, six hundred eighty-five billion, three hundred fifty-one million, eight hundred sixty-eight thousand, five hundred thirty-six".