18397756691136 has 560 divisors, whose sum is σ = 61522308207360. Its totient is φ = 5406997432320.

The previous prime is 18397756691131. The next prime is 18397756691177. The reversal of 18397756691136 is 63119665779381.

It is a happy number.

18397756691136 is a `hidden beast` number, since 18 + 3 + 9 + 7 + 7 + 566 + 9 + 11 + 36 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (18397756691131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 83710351 + ... + 83929841.

It is an arithmetic number, because the mean of its divisors is an integer number (109861264656).

Almost surely, 2^{18397756691136} is an apocalyptic number.

18397756691136 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 18397756691136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30761154103680).

18397756691136 is an abundant number, since it is smaller than the sum of its proper divisors (43124551516224).

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

18397756691136 is a wasteful number, since it uses less digits than its factorization.

18397756691136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219594 (or 219575 counting only the distinct ones).

The product of its digits is 308629440, while the sum is 72.

The spelling of 18397756691136 in words is "eighteen trillion, three hundred ninety-seven billion, seven hundred fifty-six million, six hundred ninety-one thousand, one hundred thirty-six".