16555980 has 48 divisors (see below), whose sum is σ = 52980480. Its totient is φ = 3784128.

The previous prime is 16555963. The next prime is 16555997. The reversal of 16555980 is 8955561.

It is an interprime number because it is at equal distance from previous prime (16555963) and next prime (16555997).

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, 19290 + ... + 20129.

It is an arithmetic number, because the mean of its divisors is an integer number (1103760).

Almost surely, 2^16555980 is an apocalyptic number.

16555980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16555980 is an abundant number, since it is smaller than the sum of its proper divisors (36424500).

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

16555980 is a wasteful number, since it uses less digits than its factorization.

16555980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39438 (or 39436 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 16555980 is about 4068.9040293425. The cubic root of 16555980 is about 254.8697527848.

The spelling of 16555980 in words is "sixteen million, five hundred fifty-five thousand, nine hundred eighty".