18403356312 has 48 divisors (see below), whose sum is σ = 54373555080. Its totient is φ = 5576774400.

The previous prime is 18403356299. The next prime is 18403356317. The reversal of 18403356312 is 21365330481.

18403356312 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 335 + 6 + 312 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18403356317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11617489 + ... + 11619072.

Almost surely, 2^18403356312 is an apocalyptic number.

18403356312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18403356312 is an abundant number, since it is smaller than the sum of its proper divisors (35970198768).

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

18403356312 is a wasteful number, since it uses less digits than its factorization.

18403356312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23236584 (or 23236577 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 18403356312 its reverse (21365330481), we get a palindrome (39768686793).

The spelling of 18403356312 in words is "eighteen billion, four hundred three million, three hundred fifty-six thousand, three hundred twelve".