16819851820 has 12 divisors (see below), whose sum is σ = 35321688864. Its totient is φ = 6727940720.

The previous prime is 16819851773. The next prime is 16819851823. The reversal of 16819851820 is 2815891861.

It is not an unprimeable number, because it can be changed into a prime (16819851823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420496276 + ... + 420496315.

It is an arithmetic number, because the mean of its divisors is an integer number (2943474072).

Almost surely, 2^16819851820 is an apocalyptic number.

16819851820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16819851820 is an abundant number, since it is smaller than the sum of its proper divisors (18501837044).

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

16819851820 is a wasteful number, since it uses less digits than its factorization.

16819851820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840992600 (or 840992598 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 49.

The spelling of 16819851820 in words is "sixteen billion, eight hundred nineteen million, eight hundred fifty-one thousand, eight hundred twenty".