1661000227 has 2 divisors, whose sum is σ = 1661000228. Its totient is φ = 1661000226.

The previous prime is 1661000213. The next prime is 1661000287. The reversal of 1661000227 is 7220001661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1661000227 - 2¹¹ = 1660998179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1661000207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830500113 + 830500114.

It is an arithmetic number, because the mean of its divisors is an integer number (830500114).

Almost surely, 2^1661000227 is an apocalyptic number.

1661000227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661000227 is an equidigital number, since it uses as much as digits as its factorization.

1661000227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1661000227 is about 40755.3705295388. The cubic root of 1661000227 is about 1184.2859144380.

Adding to 1661000227 its reverse (7220001661), we get a palindrome (8881001888).

The spelling of 1661000227 in words is "one billion, six hundred sixty-one million, two hundred twenty-seven", and thus it is an aban number.