89128663669 has 2 divisors, whose sum is σ = 89128663670. Its totient is φ = 89128663668.

The previous prime is 89128663667. The next prime is 89128663697. The reversal of 89128663669 is 96636682198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78879531025 + 10249132644 = 280855^2 + 101238^2 .

It is a cyclic number.

It is not a de Polignac number, because 89128663669 - 2¹ = 89128663667 is a prime.

It is a super-2 number, since 2×89128663669² (a number of 23 digits) contains 22 as substring.

Together with 89128663667, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 89128663669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89128663667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44564331834 + 44564331835.

It is an arithmetic number, because the mean of its divisors is an integer number (44564331835).

Almost surely, 2^89128663669 is an apocalyptic number.

It is an amenable number.

89128663669 is a deficient number, since it is larger than the sum of its proper divisors (1).

89128663669 is an equidigital number, since it uses as much as digits as its factorization.

89128663669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40310784, while the sum is 64.

The spelling of 89128663669 in words is "eighty-nine billion, one hundred twenty-eight million, six hundred sixty-three thousand, six hundred sixty-nine".