16556551100 has 18 divisors (see below), whose sum is σ = 35927716104. Its totient is φ = 6622620400.

The previous prime is 16556551091. The next prime is 16556551111. The reversal of 16556551100 is 115565561.

It is a super-2 number, since 2×16556551100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82782656 + ... + 82782855.

It is an arithmetic number, because the mean of its divisors is an integer number (1995984228).

Almost surely, 2^16556551100 is an apocalyptic number.

16556551100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16556551100 is an abundant number, since it is smaller than the sum of its proper divisors (19371165004).

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

16556551100 is a wasteful number, since it uses less digits than its factorization.

16556551100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165565525 (or 165565518 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 16556551100 in words is "sixteen billion, five hundred fifty-six million, five hundred fifty-one thousand, one hundred".