16555489091 has 2 divisors, whose sum is σ = 16555489092. Its totient is φ = 16555489090.

The previous prime is 16555489081. The next prime is 16555489099. The reversal of 16555489091 is 19098455561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16555489091 - 2¹⁴ = 16555472707 is a prime.

It is not a weakly prime, because it can be changed into another prime (16555489099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277744545 + 8277744546.

It is an arithmetic number, because the mean of its divisors is an integer number (8277744546).

Almost surely, 2^16555489091 is an apocalyptic number.

16555489091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16555489091 is an equidigital number, since it uses as much as digits as its factorization.

16555489091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944000, while the sum is 53.

The spelling of 16555489091 in words is "sixteen billion, five hundred fifty-five million, four hundred eighty-nine thousand, ninety-one".