128949471225 has 72 divisors (see below), whose sum is σ = 243210177600. Its totient is φ = 65128924800.

The previous prime is 128949471169. The next prime is 128949471241. The reversal of 128949471225 is 522174949821.

128949471225 is a `hidden beast` number, since 1 + 2 + 89 + 494 + 71 + 2 + 2 + 5 = 666.

It is not a de Polignac number, because 128949471225 - 2⁷ = 128949471097 is a prime.

It is a super-2 number, since 2×128949471225² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 18212236 + ... + 18219314.

Almost surely, 2^128949471225 is an apocalyptic number.

128949471225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128949471225 is a deficient number, since it is larger than the sum of its proper divisors (114260706375).

128949471225 is a wasteful number, since it uses less digits than its factorization.

128949471225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11375 (or 11367 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 128949471225 in words is "one hundred twenty-eight billion, nine hundred forty-nine million, four hundred seventy-one thousand, two hundred twenty-five".