500661001001 has 12 divisors (see below), whose sum is σ = 601188721920. Its totient is φ = 415294838280.

The previous prime is 500661000991. The next prime is 500661001003. The reversal of 500661001001 is 100100166005.

It is a happy number.

It is not a de Polignac number, because 500661001001 - 2²² = 500656806697 is a prime.

It is a super-2 number, since 2×500661001001² (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 (500661001003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164798021 + ... + 164801058.

It is an arithmetic number, because the mean of its divisors is an integer number (50099060160).

Almost surely, 2^500661001001 is an apocalyptic number.

It is an amenable number.

500661001001 is a deficient number, since it is larger than the sum of its proper divisors (100527720919).

500661001001 is a wasteful number, since it uses less digits than its factorization.

500661001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329599124 (or 329599117 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 500661001001 its reverse (100100166005), we get a palindrome (600761167006).

The spelling of 500661001001 in words is "five hundred billion, six hundred sixty-one million, one thousand, one".