18115245550 has 24 divisors (see below), whose sum is σ = 33705572616. Its totient is φ = 7243686240.

The previous prime is 18115245541. The next prime is 18115245569. The reversal of 18115245550 is 5554251181.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 95392 + ... + 212908.

It is an arithmetic number, because the mean of its divisors is an integer number (1404398859).

Almost surely, 2^18115245550 is an apocalyptic number.

18115245550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18115245550 is a deficient number, since it is larger than the sum of its proper divisors (15590327066).

18115245550 is a wasteful number, since it uses less digits than its factorization.

18115245550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120612 (or 120607 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 37.

The spelling of 18115245550 in words is "eighteen billion, one hundred fifteen million, two hundred forty-five thousand, five hundred fifty".