128551796019 has 48 divisors (see below), whose sum is σ = 201126481920. Its totient is φ = 78854186880.

The previous prime is 128551795991. The next prime is 128551796027. The reversal of 128551796019 is 910697155821.

It is a happy number.

128551796019 is a `hidden beast` number, since 1 + 2 + 8 + 551 + 79 + 6 + 0 + 19 = 666.

It is not a de Polignac number, because 128551796019 - 2¹⁷ = 128551664947 is a prime.

It is a super-2 number, since 2×128551796019² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128551796039) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1522342 + ... + 1604564.

It is an arithmetic number, because the mean of its divisors is an integer number (4190135040).

Almost surely, 2^128551796019 is an apocalyptic number.

128551796019 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

128551796019 is a deficient number, since it is larger than the sum of its proper divisors (72574685901).

128551796019 is a wasteful number, since it uses less digits than its factorization.

128551796019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82512 (or 82509 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 54.

The spelling of 128551796019 in words is "one hundred twenty-eight billion, five hundred fifty-one million, seven hundred ninety-six thousand, nineteen".