18056043550 has 24 divisors (see below), whose sum is σ = 33588810000. Its totient is φ = 7221434880.

The previous prime is 18056043457. The next prime is 18056043559. The reversal of 18056043550 is 5534065081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18056043559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 429886 + ... + 470014.

It is an arithmetic number, because the mean of its divisors is an integer number (1399533750).

Almost surely, 2^18056043550 is an apocalyptic number.

18056043550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18056043550 is a deficient number, since it is larger than the sum of its proper divisors (15532766450).

18056043550 is a wasteful number, since it uses less digits than its factorization.

18056043550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49140 (or 49135 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 18056043550 in words is "eighteen billion, fifty-six million, forty-three thousand, five hundred fifty".