128105850249 has 48 divisors (see below), whose sum is σ = 215433400000. Its totient is φ = 72666626688.

The previous prime is 128105850247. The next prime is 128105850251. The reversal of 128105850249 is 942058501821.

128105850249 is a `hidden beast` number, since 1 + 28 + 1 + 0 + 585 + 0 + 2 + 49 = 666.

It is an interprime number because it is at equal distance from previous prime (128105850247) and next prime (128105850251).

It is not a de Polignac number, because 128105850249 - 2¹ = 128105850247 is a prime.

It is a super-2 number, since 2×128105850249² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128105850247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 696499 + ... + 861000.

Almost surely, 2^128105850249 is an apocalyptic number.

128105850249 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

128105850249 is a deficient number, since it is larger than the sum of its proper divisors (87327549751).

128105850249 is a wasteful number, since it uses less digits than its factorization.

128105850249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557574 (or 1557571 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 128105850249 in words is "one hundred twenty-eight billion, one hundred five million, eight hundred fifty thousand, two hundred forty-nine".