18735917850 has 288 divisors, whose sum is σ = 56097909504. Its totient is φ = 4453977600.

The previous prime is 18735917839. The next prime is 18735917869. The reversal of 18735917850 is 5871953781.

It is a happy number.

It is a super-4 number, since 4×18735917850⁴ (a number of 42 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 22820440 + ... + 22821260.

It is an arithmetic number, because the mean of its divisors is an integer number (194784408).

Almost surely, 2^18735917850 is an apocalyptic number.

18735917850 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 18735917850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28048954752).

18735917850 is an abundant number, since it is smaller than the sum of its proper divisors (37361991654).

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

18735917850 is a wasteful number, since it uses less digits than its factorization.

18735917850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 54.

It can be divided in two parts, 187359 and 17850, that added together give a square (205209 = 453²).

The spelling of 18735917850 in words is "eighteen billion, seven hundred thirty-five million, nine hundred seventeen thousand, eight hundred fifty".