128291863655 has 16 divisors (see below), whose sum is σ = 163028596320. Its totient is φ = 96582915072.

The previous prime is 128291863619. The next prime is 128291863699. The reversal of 128291863655 is 556368192821.

It is a cyclic number.

It is not a de Polignac number, because 128291863655 - 2⁶ = 128291863591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128291863655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 539732 + ... + 740198.

It is an arithmetic number, because the mean of its divisors is an integer number (10189287270).

Almost surely, 2^128291863655 is an apocalyptic number.

128291863655 is a deficient number, since it is larger than the sum of its proper divisors (34736732665).

128291863655 is a wasteful number, since it uses less digits than its factorization.

128291863655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208018.

The product of its digits is 6220800, while the sum is 56.

The spelling of 128291863655 in words is "one hundred twenty-eight billion, two hundred ninety-one million, eight hundred sixty-three thousand, six hundred fifty-five".