18198135640 has 32 divisors (see below), whose sum is σ = 40954572000. Its totient is φ = 7277695744.

The previous prime is 18198135583. The next prime is 18198135667. The reversal of 18198135640 is 4653189181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150516 + ... + 243004.

It is an arithmetic number, because the mean of its divisors is an integer number (1279830375).

Almost surely, 2^18198135640 is an apocalyptic number.

18198135640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18198135640 is an abundant number, since it is smaller than the sum of its proper divisors (22756436360).

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

18198135640 is a wasteful number, since it uses less digits than its factorization.

18198135640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97419 (or 97415 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 18198135640 in words is "eighteen billion, one hundred ninety-eight million, one hundred thirty-five thousand, six hundred forty".