128166403 has 2 divisors, whose sum is σ = 128166404. Its totient is φ = 128166402.

The previous prime is 128166397. The next prime is 128166407. The reversal of 128166403 is 304661821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128166403 - 2¹⁷ = 128035331 is a prime.

It is not a weakly prime, because it can be changed into another prime (128166407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64083201 + 64083202.

It is an arithmetic number, because the mean of its divisors is an integer number (64083202).

Almost surely, 2^128166403 is an apocalyptic number.

128166403 is a deficient number, since it is larger than the sum of its proper divisors (1).

128166403 is an equidigital number, since it uses as much as digits as its factorization.

128166403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 128166403 is about 11321.0601535369. The cubic root of 128166403 is about 504.1867156413.

The spelling of 128166403 in words is "one hundred twenty-eight million, one hundred sixty-six thousand, four hundred three".