1661606227 has 16 divisors (see below), whose sum is σ = 1755629568. Its totient is φ = 1569522240.

The previous prime is 1661606209. The next prime is 1661606251. The reversal of 1661606227 is 7226061661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1661606227 - 2¹¹ = 1661604179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661606207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 670663 + ... + 673135.

It is an arithmetic number, because the mean of its divisors is an integer number (109726848).

Almost surely, 2^1661606227 is an apocalyptic number.

1661606227 is a deficient number, since it is larger than the sum of its proper divisors (94023341).

1661606227 is a wasteful number, since it uses less digits than its factorization.

1661606227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2850.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 1661606227 is about 40762.8044545515. The cubic root of 1661606227 is about 1184.4299220447.

Adding to 1661606227 its reverse (7226061661), we get a palindrome (8887667888).

The spelling of 1661606227 in words is "one billion, six hundred sixty-one million, six hundred six thousand, two hundred twenty-seven".