16555489123 has 2 divisors, whose sum is σ = 16555489124. Its totient is φ = 16555489122.

The previous prime is 16555489099. The next prime is 16555489129. The reversal of 16555489123 is 32198455561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16555489123 - 2⁵ = 16555489091 is a prime.

It is not a weakly prime, because it can be changed into another prime (16555489129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277744561 + 8277744562.

It is an arithmetic number, because the mean of its divisors is an integer number (8277744562).

Almost surely, 2^16555489123 is an apocalyptic number.

16555489123 is a deficient number, since it is larger than the sum of its proper divisors (1).

16555489123 is an equidigital number, since it uses as much as digits as its factorization.

16555489123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296000, while the sum is 49.

The spelling of 16555489123 in words is "sixteen billion, five hundred fifty-five million, four hundred eighty-nine thousand, one hundred twenty-three".