18331737128 has 8 divisors (see below), whose sum is σ = 34372007130. Its totient is φ = 9165868560.

The previous prime is 18331737121. The next prime is 18331737133. The reversal of 18331737128 is 82173713381.

It can be written as a sum of positive squares in only one way, i.e., 17854838884 + 476898244 = 133622^2 + 21838^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18331737128² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18331737121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145733563 + ... + 1145733578.

Almost surely, 2^18331737128 is an apocalyptic number.

It is an amenable number.

18331737128 is a deficient number, since it is larger than the sum of its proper divisors (16040270002).

18331737128 is a wasteful number, since it uses less digits than its factorization.

18331737128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291467147 (or 2291467143 counting only the distinct ones).

The product of its digits is 169344, while the sum is 44.

The spelling of 18331737128 in words is "eighteen billion, three hundred thirty-one million, seven hundred thirty-seven thousand, one hundred twenty-eight".