65505028055551 has 16 divisors (see below), whose sum is σ = 77479419689280. Its totient is φ = 54213004984320.

The previous prime is 65505028055483. The next prime is 65505028055563. The reversal of 65505028055551 is 15555082050556.

It is a happy number.

It is not a de Polignac number, because 65505028055551 - 2⁹ = 65505028055039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65505028055591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1176469666 + ... + 1176525343.

It is an arithmetic number, because the mean of its divisors is an integer number (4842463730580).

Almost surely, 2^{65505028055551} is an apocalyptic number.

65505028055551 is a deficient number, since it is larger than the sum of its proper divisors (11974391633729).

65505028055551 is a wasteful number, since it uses less digits than its factorization.

65505028055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352995154.

The product of its (nonzero) digits is 7500000, while the sum is 52.

The spelling of 65505028055551 in words is "sixty-five trillion, five hundred five billion, twenty-eight million, fifty-five thousand, five hundred fifty-one".