1606357666 has 16 divisors (see below), whose sum is σ = 2418579000. Its totient is φ = 800171008.

The previous prime is 1606357663. The next prime is 1606357667. The reversal of 1606357666 is 6667536061.

It can be written as a sum of positive squares in 4 ways, for example, as 1090386441 + 515971225 = 33021^2 + 22715^2 .

It is a super-2 number, since 2×1606357666² = 5160769902233935112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1606357663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 995076 + ... + 996688.

Almost surely, 2^1606357666 is an apocalyptic number.

1606357666 is a deficient number, since it is larger than the sum of its proper divisors (812221334).

1606357666 is a wasteful number, since it uses less digits than its factorization.

1606357666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173.

The product of its (nonzero) digits is 816480, while the sum is 46.

The square root of 1606357666 is about 40079.3920363071. The cubic root of 1606357666 is about 1171.1542085979.

The spelling of 1606357666 in words is "one billion, six hundred six million, three hundred fifty-seven thousand, six hundred sixty-six".