18685351850 has 24 divisors (see below), whose sum is σ = 37914278688. Its totient is φ = 6794673200.

The previous prime is 18685351837. The next prime is 18685351859. The reversal of 18685351850 is 5815358681.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (18685351859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16986134 + ... + 16987233.

It is an arithmetic number, because the mean of its divisors is an integer number (1579761612).

Almost surely, 2^18685351850 is an apocalyptic number.

18685351850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18685351850 is an abundant number, since it is smaller than the sum of its proper divisors (19228926838).

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

18685351850 is a wasteful number, since it uses less digits than its factorization.

18685351850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33973390 (or 33973385 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 50.

The spelling of 18685351850 in words is "eighteen billion, six hundred eighty-five million, three hundred fifty-one thousand, eight hundred fifty".