16555641 has 4 divisors (see below), whose sum is σ = 22074192. Its totient is φ = 11037092.

The previous prime is 16555639. The next prime is 16555657. The reversal of 16555641 is 14655561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16555641 - 2¹ = 16555639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16555601) 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, 2759271 + ... + 2759276.

It is an arithmetic number, because the mean of its divisors is an integer number (5518548).

Almost surely, 2^16555641 is an apocalyptic number.

It is an amenable number.

16555641 is a deficient number, since it is larger than the sum of its proper divisors (5518551).

16555641 is an equidigital number, since it uses as much as digits as its factorization.

16555641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5518550.

The product of its digits is 18000, while the sum is 33.

The square root of 16555641 is about 4068.8623717201. The cubic root of 16555641 is about 254.8680132032.

The spelling of 16555641 in words is "sixteen million, five hundred fifty-five thousand, six hundred forty-one".