18055571640 has 32 divisors (see below), whose sum is σ = 54166715280. Its totient is φ = 4814819072.

The previous prime is 18055571629. The next prime is 18055571663. The reversal of 18055571640 is 4617555081.

It is a junction number, because it is equal to n+sod(n) for n = 18055571592 and 18055571601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75231429 + ... + 75231668.

Almost surely, 2^18055571640 is an apocalyptic number.

18055571640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18055571640 is an abundant number, since it is smaller than the sum of its proper divisors (36111143640).

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

18055571640 is a wasteful number, since it uses less digits than its factorization.

18055571640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150463111 (or 150463107 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 42.

The spelling of 18055571640 in words is "eighteen billion, fifty-five million, five hundred seventy-one thousand, six hundred forty".