505556001001 has 4 divisors (see below), whose sum is σ = 532164211600. Its totient is φ = 478947790404.

The previous prime is 505556000977. The next prime is 505556001023. The reversal of 505556001001 is 100100655505.

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, and also an emirpimes, since its reverse is a distinct semiprime: 100100655505 = 5 ⋅20020131101.

It is a cyclic number.

It is not a de Polignac number, because 505556001001 - 2²³ = 505547612393 is a prime.

It is a super-2 number, since 2×505556001001² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505556001091) 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, 13304105271 + ... + 13304105308.

It is an arithmetic number, because the mean of its divisors is an integer number (133041052900).

Almost surely, 2^505556001001 is an apocalyptic number.

It is an amenable number.

505556001001 is a deficient number, since it is larger than the sum of its proper divisors (26608210599).

505556001001 is a wasteful number, since it uses less digits than its factorization.

505556001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26608210598.

The product of its (nonzero) digits is 3750, while the sum is 28.

Adding to 505556001001 its reverse (100100655505), we get a palindrome (605656656506).

The spelling of 505556001001 in words is "five hundred five billion, five hundred fifty-six million, one thousand, one".