18078458550 has 24 divisors (see below), whose sum is σ = 44834577576. Its totient is φ = 4820922240.

The previous prime is 18078458543. The next prime is 18078458611. The reversal of 18078458550 is 5585487081.

It is a junction number, because it is equal to n+sod(n) for n = 18078458493 and 18078458502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60261379 + ... + 60261678.

It is an arithmetic number, because the mean of its divisors is an integer number (1868107399).

Almost surely, 2^18078458550 is an apocalyptic number.

18078458550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18078458550 is an abundant number, since it is smaller than the sum of its proper divisors (26756119026).

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

18078458550 is a wasteful number, since it uses less digits than its factorization.

18078458550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120523072 (or 120523067 counting only the distinct ones).

The product of its (nonzero) digits is 1792000, while the sum is 51.

The spelling of 18078458550 in words is "eighteen billion, seventy-eight million, four hundred fifty-eight thousand, five hundred fifty".