255166661 has 2 divisors, whose sum is σ = 255166662. Its totient is φ = 255166660.

The previous prime is 255166633. The next prime is 255166693. The reversal of 255166661 is 166661552.

255166661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233020225 + 22146436 = 15265^2 + 4706^2 .

It is a cyclic number.

It is not a de Polignac number, because 255166661 - 2¹⁰ = 255165637 is a prime.

It is a super-2 number, since 2×255166661² = 130220049771777842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255166631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127583330 + 127583331.

It is an arithmetic number, because the mean of its divisors is an integer number (127583331).

Almost surely, 2^255166661 is an apocalyptic number.

It is an amenable number.

255166661 is a deficient number, since it is larger than the sum of its proper divisors (1).

255166661 is an equidigital number, since it uses as much as digits as its factorization.

255166661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 38.

The square root of 255166661 is about 15973.9369286347. The cubic root of 255166661 is about 634.2706909991.

The spelling of 255166661 in words is "two hundred fifty-five million, one hundred sixty-six thousand, six hundred sixty-one".