1666461005 has 12 divisors (see below), whose sum is σ = 2198076636. Its totient is φ = 1211971200.

The previous prime is 1666460977. The next prime is 1666461029. The reversal of 1666461005 is 5001646661.

It can be written as a sum of positive squares in 2 ways, for example, as 921061801 + 745399204 = 30349^2 + 27302^2 .

It is not a de Polignac number, because 1666461005 - 2⁸ = 1666460749 is a prime.

It is a super-2 number, since 2×1666461005² = 5554184562371220050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1376636 + ... + 1377845.

It is an arithmetic number, because the mean of its divisors is an integer number (183173053).

Almost surely, 2^1666461005 is an apocalyptic number.

It is an amenable number.

1666461005 is a deficient number, since it is larger than the sum of its proper divisors (531615631).

1666461005 is a wasteful number, since it uses less digits than its factorization.

1666461005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2754508 (or 2754497 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1666461005 is about 40822.3101379626. The cubic root of 1666461005 is about 1185.5823317169.

The spelling of 1666461005 in words is "one billion, six hundred sixty-six million, four hundred sixty-one thousand, five".