505561100004 has 18 divisors (see below), whose sum is σ = 1277946113990. Its totient is φ = 168520366656.

The previous prime is 505561099999. The next prime is 505561100021. The reversal of 505561100004 is 400001165505.

It is a happy number.

505561100004 is a `hidden beast` number, since 5 + 0 + 556 + 1 + 100 + 0 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 417512407104 + 88048692900 = 646152^2 + 296730^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7021681909 + ... + 7021681980.

Almost surely, 2^505561100004 is an apocalyptic number.

It is an amenable number.

505561100004 is an abundant number, since it is smaller than the sum of its proper divisors (772385013986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505561100004 is a wasteful number, since it uses less digits than its factorization.

505561100004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14043363899 (or 14043363894 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 505561100004 its reverse (400001165505), we get a palindrome (905562265509).

The spelling of 505561100004 in words is "five hundred five billion, five hundred sixty-one million, one hundred thousand, four".