128673630551 has 4 divisors (see below), whose sum is σ = 128734935000. Its totient is φ = 128612326104.

The previous prime is 128673630539. The next prime is 128673630601. The reversal of 128673630551 is 155036376821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155036376821 = 53 ⋅2925214657.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128673630551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128673630496 and 128673630505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128673630451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30649076 + ... + 30653273.

It is an arithmetic number, because the mean of its divisors is an integer number (32183733750).

Almost surely, 2^128673630551 is an apocalyptic number.

128673630551 is a deficient number, since it is larger than the sum of its proper divisors (61304449).

128673630551 is an equidigital number, since it uses as much as digits as its factorization.

128673630551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61304448.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 128673630551 in words is "one hundred twenty-eight billion, six hundred seventy-three million, six hundred thirty thousand, five hundred fifty-one".