505990100001 has 4 divisors (see below), whose sum is σ = 674653466672. Its totient is φ = 337326733332.

The previous prime is 505990099987. The next prime is 505990100051. The reversal of 505990100001 is 100001099505.

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 not a de Polignac number, because 505990100001 - 2⁵ = 505990099969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505990100051) 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, 84331683331 + ... + 84331683336.

It is an arithmetic number, because the mean of its divisors is an integer number (168663366668).

Almost surely, 2^505990100001 is an apocalyptic number.

It is an amenable number.

505990100001 is a deficient number, since it is larger than the sum of its proper divisors (168663366671).

505990100001 is a wasteful number, since it uses less digits than its factorization.

505990100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168663366670.

The product of its (nonzero) digits is 2025, while the sum is 30.

Adding to 505990100001 its reverse (100001099505), we get a palindrome (605991199506).

The spelling of 505990100001 in words is "five hundred five billion, nine hundred ninety million, one hundred thousand, one".