18129549263688 has 96 divisors (see below), whose sum is σ = 53599382272800. Its totient is φ = 5725120808448.

The previous prime is 18129549263681. The next prime is 18129549263717. The reversal of 18129549263688 is 88636294592181.

18129549263688 is a `hidden beast` number, since 1 + 8 + 1 + 29 + 5 + 492 + 6 + 36 + 88 = 666.

It is a super-2 number, since 2×18129549263688² (a number of 27 digits) contains 22 as substring.

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 (18129549263681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 245381481 + ... + 245455352.

It is an arithmetic number, because the mean of its divisors is an integer number (558326898675).

Almost surely, 2^{18129549263688} is an apocalyptic number.

18129549263688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18129549263688 is an abundant number, since it is smaller than the sum of its proper divisors (35469833009112).

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

18129549263688 is a wasteful number, since it uses less digits than its factorization.

18129549263688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490836873 (or 490836857 counting only the distinct ones).

The product of its digits is 358318080, while the sum is 72.

The spelling of 18129549263688 in words is "eighteen trillion, one hundred twenty-nine billion, five hundred forty-nine million, two hundred sixty-three thousand, six hundred eighty-eight".