18117081211450 has 96 divisors (see below), whose sum is σ = 36342576270000. Its totient is φ = 6679681873920.

The previous prime is 18117081211393. The next prime is 18117081211457. The reversal of 18117081211450 is 5411218071181.

It can be written as a sum of positive squares in 24 ways, for example, as 5135349709161 + 12981731502289 = 2266131^2 + 3603017^2 .

It is a super-2 number, since 2×18117081211450² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18117081211457) 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 47 ways as a sum of consecutive naturals, for example, 1810074046 + ... + 1810084054.

Almost surely, 2^{18117081211450} is an apocalyptic number.

18117081211450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18117081211450 is an abundant number, since it is smaller than the sum of its proper divisors (18225495058550).

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

18117081211450 is a wasteful number, since it uses less digits than its factorization.

18117081211450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13796 (or 13791 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 40.

The spelling of 18117081211450 in words is "eighteen trillion, one hundred seventeen billion, eighty-one million, two hundred eleven thousand, four hundred fifty".