65551127666551 has 4 divisors (see below), whose sum is σ = 65660197763104. Its totient is φ = 65442057570000.

The previous prime is 65551127666491. The next prime is 65551127666567. The reversal of 65551127666551 is 15566672115556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65551127666551 - 2⁹ = 65551127666039 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65551127666551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65551127666051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54535047375 + ... + 54535048576.

It is an arithmetic number, because the mean of its divisors is an integer number (16415049440776).

Almost surely, 2^{65551127666551} is an apocalyptic number.

65551127666551 is a deficient number, since it is larger than the sum of its proper divisors (109070096553).

65551127666551 is a wasteful number, since it uses less digits than its factorization.

65551127666551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109070096552.

The product of its digits is 56700000, while the sum is 61.

The spelling of 65551127666551 in words is "sixty-five trillion, five hundred fifty-one billion, one hundred twenty-seven million, six hundred sixty-six thousand, five hundred fifty-one".