505544240551 has 24 divisors (see below), whose sum is σ = 644146726320. Its totient is φ = 393770748672.

The previous prime is 505544240521. The next prime is 505544240563. The reversal of 505544240551 is 155042445505.

It is not a de Polignac number, because 505544240551 - 2⁵ = 505544240519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505544240521) 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 23 ways as a sum of consecutive naturals, for example, 10439565 + ... + 10487878.

It is an arithmetic number, because the mean of its divisors is an integer number (26839446930).

Almost surely, 2^505544240551 is an apocalyptic number.

505544240551 is a deficient number, since it is larger than the sum of its proper divisors (138602485769).

505544240551 is a wasteful number, since it uses less digits than its factorization.

505544240551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20927503 (or 20927496 counting only the distinct ones).

The product of its (nonzero) digits is 400000, while the sum is 40.

The spelling of 505544240551 in words is "five hundred five billion, five hundred forty-four million, two hundred forty thousand, five hundred fifty-one".