500166661 has 4 divisors (see below), whose sum is σ = 505022752. Its totient is φ = 495310572.

The previous prime is 500166631. The next prime is 500166691. The reversal of 500166661 is 166661005.

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 an interprime number because it is at equal distance from previous prime (500166631) and next prime (500166691).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-500166661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500166631) 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, 2427891 + ... + 2428096.

It is an arithmetic number, because the mean of its divisors is an integer number (126255688).

Almost surely, 2^500166661 is an apocalyptic number.

It is an amenable number.

500166661 is a deficient number, since it is larger than the sum of its proper divisors (4856091).

500166661 is a wasteful number, since it uses less digits than its factorization.

500166661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4856090.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 500166661 is about 22364.4061177577. The cubic root of 500166661 is about 793.7887021367.

The spelling of 500166661 in words is "five hundred million, one hundred sixty-six thousand, six hundred sixty-one".