500501661 has 24 divisors (see below), whose sum is σ = 740720544. Its totient is φ = 298124640.

The previous prime is 500501653. The next prime is 500501663. The reversal of 500501661 is 166105005.

It is not a de Polignac number, because 500501661 - 2³ = 500501653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500501663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112695 + ... + 117051.

It is an arithmetic number, because the mean of its divisors is an integer number (30863356).

Almost surely, 2^500501661 is an apocalyptic number.

It is an amenable number.

500501661 is a deficient number, since it is larger than the sum of its proper divisors (240218883).

500501661 is a wasteful number, since it uses less digits than its factorization.

500501661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489 (or 4430 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 500501661 is about 22371.8944436988. The cubic root of 500501661 is about 793.9658829907.

Adding to 500501661 its reverse (166105005), we get a palindrome (666606666).

The spelling of 500501661 in words is "five hundred million, five hundred one thousand, six hundred sixty-one".