128779545951 has 24 divisors (see below), whose sum is σ = 221933006640. Its totient is φ = 73588311216.

The previous prime is 128779545949. The next prime is 128779545967. The reversal of 128779545951 is 159545977821.

128779545951 is a `hidden beast` number, since 1 + 2 + 87 + 7 + 9 + 545 + 9 + 5 + 1 = 666.

It is not a de Polignac number, because 128779545951 - 2¹ = 128779545949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128779545911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48668196 + ... + 48670841.

It is an arithmetic number, because the mean of its divisors is an integer number (9247208610).

Almost surely, 2^128779545951 is an apocalyptic number.

128779545951 is a deficient number, since it is larger than the sum of its proper divisors (93153460689).

128779545951 is an equidigital number, since it uses as much as digits as its factorization.

128779545951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97339060 (or 97339047 counting only the distinct ones).

The product of its digits is 31752000, while the sum is 63.

The spelling of 128779545951 in words is "one hundred twenty-eight billion, seven hundred seventy-nine million, five hundred forty-five thousand, nine hundred fifty-one".