18781903350 has 720 divisors, whose sum is σ = 65024695296. Its totient is φ = 4000752000.

The previous prime is 18781903321. The next prime is 18781903379. The reversal of 18781903350 is 5330918781.

It is an interprime number because it is at equal distance from previous prime (18781903321) and next prime (18781903379).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 18781903296 and 18781903305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 264533815 + ... + 264533885.

Almost surely, 2^18781903350 is an apocalyptic number.

18781903350 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18781903350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32512347648).

18781903350 is an abundant number, since it is smaller than the sum of its proper divisors (46242791946).

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

18781903350 is a wasteful number, since it uses less digits than its factorization.

18781903350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 18781903350 in words is "eighteen billion, seven hundred eighty-one million, nine hundred three thousand, three hundred fifty".