128551667 has 2 divisors, whose sum is σ = 128551668. Its totient is φ = 128551666.

The previous prime is 128551651. The next prime is 128551673. The reversal of 128551667 is 766155821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128551667 - 2⁴ = 128551651 is a prime.

It is not a weakly prime, because it can be changed into another prime (128551607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64275833 + 64275834.

It is an arithmetic number, because the mean of its divisors is an integer number (64275834).

Almost surely, 2^128551667 is an apocalyptic number.

128551667 is a deficient number, since it is larger than the sum of its proper divisors (1).

128551667 is an equidigital number, since it uses as much as digits as its factorization.

128551667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 128551667 is about 11338.0627533984. The cubic root of 128551667 is about 504.6913998625.

The spelling of 128551667 in words is "one hundred twenty-eight million, five hundred fifty-one thousand, six hundred sixty-seven".