228667661 has 2 divisors, whose sum is σ = 228667662. Its totient is φ = 228667660.

The previous prime is 228667631. The next prime is 228667669. The reversal of 228667661 is 166766822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190302025 + 38365636 = 13795^2 + 6194^2 .

It is a cyclic number.

It is not a de Polignac number, because 228667661 - 2⁶ = 228667597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228667669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114333830 + 114333831.

It is an arithmetic number, because the mean of its divisors is an integer number (114333831).

Almost surely, 2^228667661 is an apocalyptic number.

It is an amenable number.

228667661 is a deficient number, since it is larger than the sum of its proper divisors (1).

228667661 is an equidigital number, since it uses as much as digits as its factorization.

228667661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The square root of 228667661 is about 15121.7611738845. The cubic root of 228667661 is about 611.5072116714.

The spelling of 228667661 in words is "two hundred twenty-eight million, six hundred sixty-seven thousand, six hundred sixty-one".