5166661 has 2 divisors, whose sum is σ = 5166662. Its totient is φ = 5166660.

The previous prime is 5166653. The next prime is 5166671. The reversal of 5166661 is 1666615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2825761 + 2340900 = 1681^2 + 1530^2 .

It is a cyclic number.

It is not a de Polignac number, because 5166661 - 2³ = 5166653 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5166631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583330 + 2583331.

It is an arithmetic number, because the mean of its divisors is an integer number (2583331).

Almost surely, 2^5166661 is an apocalyptic number.

It is an amenable number.

5166661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5166661 is an equidigital number, since it uses as much as digits as its factorization.

5166661 is an evil number, because the sum of its binary digits is even.

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

The square root of 5166661 is about 2273.0290363302. The cubic root of 5166661 is about 172.8767763857.

The spelling of 5166661 in words is "five million, one hundred sixty-six thousand, six hundred sixty-one".