18263661380 has 24 divisors (see below), whose sum is σ = 39169726848. Its totient is φ = 7150028768.

The previous prime is 18263661349. The next prime is 18263661401. The reversal of 18263661380 is 8316636281.

It is a super-2 number, since 2×18263661380² (a number of 21 digits) contains 22 as substring.

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, 9713774 + ... + 9715653.

It is an arithmetic number, because the mean of its divisors is an integer number (1632071952).

Almost surely, 2^18263661380 is an apocalyptic number.

18263661380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18263661380 is an abundant number, since it is smaller than the sum of its proper divisors (20906065468).

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

18263661380 is a wasteful number, since it uses less digits than its factorization.

18263661380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19429483 (or 19429481 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 18263661380 in words is "eighteen billion, two hundred sixty-three million, six hundred sixty-one thousand, three hundred eighty".