128465895921 has 8 divisors (see below), whose sum is σ = 186859485024. Its totient is φ = 77858118720.

The previous prime is 128465895823. The next prime is 128465895931. The reversal of 128465895921 is 129598564821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128465895921 - 2³⁵ = 94106157553 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (128465895931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1946452936 + ... + 1946453001.

It is an arithmetic number, because the mean of its divisors is an integer number (23357435628).

Almost surely, 2^128465895921 is an apocalyptic number.

128465895921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128465895921 is a deficient number, since it is larger than the sum of its proper divisors (58393589103).

128465895921 is a wasteful number, since it uses less digits than its factorization.

128465895921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892905951.

The product of its digits is 12441600, while the sum is 60.

The spelling of 128465895921 in words is "one hundred twenty-eight billion, four hundred sixty-five million, eight hundred ninety-five thousand, nine hundred twenty-one".