128995305465 has 32 divisors (see below), whose sum is σ = 235343477376. Its totient is φ = 59769768960.

The previous prime is 128995305463. The next prime is 128995305473. The reversal of 128995305465 is 564503599821.

It is a happy number.

It is not a de Polignac number, because 128995305465 - 2¹ = 128995305463 is a prime.

It is a super-3 number, since 3×128995305465³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (128995305463) 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 31 ways as a sum of consecutive naturals, for example, 19452991 + ... + 19459620.

It is an arithmetic number, because the mean of its divisors is an integer number (7354483668).

Almost surely, 2^128995305465 is an apocalyptic number.

128995305465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128995305465 is a deficient number, since it is larger than the sum of its proper divisors (106348171911).

128995305465 is a wasteful number, since it uses less digits than its factorization.

128995305465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38912649.

The product of its (nonzero) digits is 11664000, while the sum is 57.

The spelling of 128995305465 in words is "one hundred twenty-eight billion, nine hundred ninety-five million, three hundred five thousand, four hundred sixty-five".