18487944657122 has 32 divisors (see below), whose sum is σ = 28950923628144. Its totient is φ = 8846327526400.

The previous prime is 18487944657109. The next prime is 18487944657131. The reversal of 18487944657122 is 22175644978481.

It is a Cunningham number, because it is equal to 4299761²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 890850934801 + 17597093722321 = 943849^2 + 4194889^2 .

It is a super-2 number, since 2×18487944657122² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18625622 + ... + 19593102.

Almost surely, 2^{18487944657122} is an apocalyptic number.

18487944657122 is a deficient number, since it is larger than the sum of its proper divisors (10462978971022).

18487944657122 is a wasteful number, since it uses less digits than its factorization.

18487944657122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971974.

The product of its digits is 216760320, while the sum is 68.

The spelling of 18487944657122 in words is "eighteen trillion, four hundred eighty-seven billion, nine hundred forty-four million, six hundred fifty-seven thousand, one hundred twenty-two".