501661001141 has 4 divisors (see below), whose sum is σ = 502266141900. Its totient is φ = 501055860384.

The previous prime is 501661001137. The next prime is 501661001209. The reversal of 501661001141 is 141100166105.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 349505616100 + 152155385041 = 591190^2 + 390071^2 .

It is a cyclic number.

It is not a de Polignac number, because 501661001141 - 2² = 501661001137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 501661001141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501661006141) 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, 302569136 + ... + 302570793.

It is an arithmetic number, because the mean of its divisors is an integer number (125566535475).

Almost surely, 2^501661001141 is an apocalyptic number.

It is an amenable number.

501661001141 is a deficient number, since it is larger than the sum of its proper divisors (605140759).

501661001141 is an equidigital number, since it uses as much as digits as its factorization.

501661001141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605140758.

The product of its (nonzero) digits is 720, while the sum is 26.

Adding to 501661001141 its reverse (141100166105), we get a palindrome (642761167246).

The spelling of 501661001141 in words is "five hundred one billion, six hundred sixty-one million, one thousand, one hundred forty-one".