505561110551 has 16 divisors (see below), whose sum is σ = 598575544320. Its totient is φ = 417845463840.

The previous prime is 505561110541. The next prime is 505561110581. The reversal of 505561110551 is 155011165505.

It is not a de Polignac number, because 505561110551 - 2¹⁴ = 505561094167 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 (505561110541) 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, 4145261 + ... + 4265478.

It is an arithmetic number, because the mean of its divisors is an integer number (37410971520).

Almost surely, 2^505561110551 is an apocalyptic number.

505561110551 is a deficient number, since it is larger than the sum of its proper divisors (93014433769).

505561110551 is a wasteful number, since it uses less digits than its factorization.

505561110551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8411054.

The product of its (nonzero) digits is 18750, while the sum is 35.

The spelling of 505561110551 in words is "five hundred five billion, five hundred sixty-one million, one hundred ten thousand, five hundred fifty-one".