505500550061 has 4 divisors (see below), whose sum is σ = 544385207772. Its totient is φ = 466615892352.

The previous prime is 505500550019. The next prime is 505500550081. The reversal of 505500550061 is 160055005505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 160055005505 = 5 ⋅32011001101.

It can be written as a sum of positive squares in 2 ways, for example, as 158822175625 + 346678374436 = 398525^2 + 588794^2 .

It is a cyclic number.

It is not a de Polignac number, because 505500550061 - 2¹⁸ = 505500287917 is a prime.

It is a super-2 number, since 2×505500550061² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505500550081) 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, 19442328836 + ... + 19442328861.

It is an arithmetic number, because the mean of its divisors is an integer number (136096301943).

Almost surely, 2^505500550061 is an apocalyptic number.

It is an amenable number.

505500550061 is a deficient number, since it is larger than the sum of its proper divisors (38884657711).

505500550061 is a wasteful number, since it uses less digits than its factorization.

505500550061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38884657710.

The product of its (nonzero) digits is 18750, while the sum is 32.

Adding to 505500550061 its reverse (160055005505), we get a palindrome (665555555566).

The spelling of 505500550061 in words is "five hundred five billion, five hundred million, five hundred fifty thousand, sixty-one".