505555403261 has 16 divisors (see below), whose sum is σ = 587965910400. Its totient is φ = 431174988288.

The previous prime is 505555403251. The next prime is 505555403263. The reversal of 505555403261 is 162304555505.

It is a cyclic number.

It is not a de Polignac number, because 505555403261 - 2¹⁴ = 505555386877 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 (505555403263) 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, 34018376 + ... + 34033233.

It is an arithmetic number, because the mean of its divisors is an integer number (36747869400).

Almost surely, 2^505555403261 is an apocalyptic number.

It is an amenable number.

505555403261 is a deficient number, since it is larger than the sum of its proper divisors (82410507139).

505555403261 is a wasteful number, since it uses less digits than its factorization.

505555403261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68051668.

The product of its (nonzero) digits is 450000, while the sum is 41.

Adding to 505555403261 its reverse (162304555505), we get a palindrome (667859958766).

The spelling of 505555403261 in words is "five hundred five billion, five hundred fifty-five million, four hundred three thousand, two hundred sixty-one".