128663551 has 2 divisors, whose sum is σ = 128663552. Its totient is φ = 128663550.

The previous prime is 128663539. The next prime is 128663593. The reversal of 128663551 is 155366821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128663551 - 2⁵ = 128663519 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128663551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128663501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64331775 + 64331776.

It is an arithmetic number, because the mean of its divisors is an integer number (64331776).

Almost surely, 2^128663551 is an apocalyptic number.

128663551 is a deficient number, since it is larger than the sum of its proper divisors (1).

128663551 is an equidigital number, since it uses as much as digits as its factorization.

128663551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 37.

The square root of 128663551 is about 11342.9956801543. The cubic root of 128663551 is about 504.8377755571.

The spelling of 128663551 in words is "one hundred twenty-eight million, six hundred sixty-three thousand, five hundred fifty-one".