128063601261 has 16 divisors (see below), whose sum is σ = 189901374400. Its totient is φ = 85295849904.

The previous prime is 128063601257. The next prime is 128063601299. The reversal of 128063601261 is 162106360821.

It is a happy number.

128063601261 is a `hidden beast` number, since 1 + 2 + 8 + 0 + 636 + 0 + 12 + 6 + 1 = 666.

It is not a de Polignac number, because 128063601261 - 2² = 128063601257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128063601161) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2189611 + ... + 2247336.

It is an arithmetic number, because the mean of its divisors is an integer number (11868835900).

Almost surely, 2^128063601261 is an apocalyptic number.

It is an amenable number.

128063601261 is a deficient number, since it is larger than the sum of its proper divisors (61837773139).

128063601261 is a wasteful number, since it uses less digits than its factorization.

128063601261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4438025 (or 4438019 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 128063601261 in words is "one hundred twenty-eight billion, sixty-three million, six hundred one thousand, two hundred sixty-one".