16555512020 has 12 divisors (see below), whose sum is σ = 34766575284. Its totient is φ = 6622204800.

The previous prime is 16555512011. The next prime is 16555512047. The reversal of 16555512020 is 2021555561.

It can be written as a sum of positive squares in 2 ways, for example, as 2593253776 + 13962258244 = 50924^2 + 118162^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413887781 + ... + 413887820.

It is an arithmetic number, because the mean of its divisors is an integer number (2897214607).

Almost surely, 2^16555512020 is an apocalyptic number.

16555512020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16555512020 is an abundant number, since it is smaller than the sum of its proper divisors (18211063264).

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

16555512020 is a wasteful number, since it uses less digits than its factorization.

16555512020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827775610 (or 827775608 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 16555512020 in words is "sixteen billion, five hundred fifty-five million, five hundred twelve thousand, twenty".