505511100001 has 4 divisors (see below), whose sum is σ = 505572434352. Its totient is φ = 505449765652.

The previous prime is 505511099981. The next prime is 505511100013. The reversal of 505511100001 is 100001115505.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505511100001 - 2¹⁷ = 505510968929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505511100301) 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 3 ways as a sum of consecutive naturals, for example, 30654811 + ... + 30671296.

It is an arithmetic number, because the mean of its divisors is an integer number (126393108588).

Almost surely, 2^505511100001 is an apocalyptic number.

It is an amenable number.

505511100001 is a deficient number, since it is larger than the sum of its proper divisors (61334351).

505511100001 is an equidigital number, since it uses as much as digits as its factorization.

505511100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61334350.

The product of its (nonzero) digits is 125, while the sum is 19.

Adding to 505511100001 its reverse (100001115505), we get a palindrome (605512215506).

The spelling of 505511100001 in words is "five hundred five billion, five hundred eleven million, one hundred thousand, one".