18151633984 has 63 divisors (see below), whose sum is σ = 39617722263. Its totient is φ = 8245353600.

The previous prime is 18151633979. The next prime is 18151633987. The reversal of 18151633984 is 48933615181.

The square root of 18151633984 is 134728.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18151633987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11855299 + ... + 11856829.

Almost surely, 2^18151633984 is an apocalyptic number.

18151633984 is the 134728-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18151633984

18151633984 is an abundant number, since it is smaller than the sum of its proper divisors (21466088279).

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

18151633984 is an frugal number, since it uses more digits than its factorization.

18151633984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096 (or 1544 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

Multiplying 18151633984 by its sum of digits (49), we get a square (889430065216 = 943096²).

The spelling of 18151633984 in words is "eighteen billion, one hundred fifty-one million, six hundred thirty-three thousand, nine hundred eighty-four".