16611800820 has 48 divisors (see below), whose sum is σ = 46575768960. Its totient is φ = 4423839616.

The previous prime is 16611800813. The next prime is 16611800897. The reversal of 16611800820 is 2800811661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141735 + ... + 230894.

It is an arithmetic number, because the mean of its divisors is an integer number (970328520).

Almost surely, 2^16611800820 is an apocalyptic number.

16611800820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16611800820 is an abundant number, since it is smaller than the sum of its proper divisors (29963968140).

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

16611800820 is a wasteful number, since it uses less digits than its factorization.

16611800820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373384 (or 373382 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The spelling of 16611800820 in words is "sixteen billion, six hundred eleven million, eight hundred thousand, eight hundred twenty".