18281185965 has 48 divisors (see below), whose sum is σ = 36710289408. Its totient is φ = 8242622208.

The previous prime is 18281185963. The next prime is 18281185969. The reversal of 18281185965 is 56958118281.

18281185965 is a `hidden beast` number, since 18 + 28 + 1 + 18 + 596 + 5 = 666.

It is not a de Polignac number, because 18281185965 - 2¹ = 18281185963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18281185963) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 374509 + ... + 420498.

It is an arithmetic number, because the mean of its divisors is an integer number (764797696).

Almost surely, 2^18281185965 is an apocalyptic number.

18281185965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18281185965 is an abundant number, since it is smaller than the sum of its proper divisors (18429103443).

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

18281185965 is a wasteful number, since it uses less digits than its factorization.

18281185965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795098 (or 795095 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 54.

The spelling of 18281185965 in words is "eighteen billion, two hundred eighty-one million, one hundred eighty-five thousand, nine hundred sixty-five".