1666354041 has 27 divisors (see below), whose sum is σ = 2647802703. Its totient is φ = 1009095120.

The previous prime is 1666354033. The next prime is 1666354069. The reversal of 1666354041 is 1404536661.

It is a happy number.

The square root of 1666354041 is 40821.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1258475625 + 407878416 = 35475^2 + 20196^2 .

It is not a de Polignac number, because 1666354041 - 2³ = 1666354033 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1666353987 and 1666354005.

It is not an unprimeable number, because it can be changed into a prime (1666354441) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1346475 + ... + 1347711.

Almost surely, 2^1666354041 is an apocalyptic number.

1666354041 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1666354041 is the 40821-st square number.

1666354041 is the 20411-st centered octagonal number.

It is an amenable number.

1666354041 is a deficient number, since it is larger than the sum of its proper divisors (981448662).

1666354041 is an equidigital number, since it uses as much as digits as its factorization.

1666354041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502 (or 1251 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The cubic root of 1666354041 is about 1185.5569651184.

Multiplying 1666354041 by its sum of digits (36), we get a square (59988745476 = 244926²).

The spelling of 1666354041 in words is "one billion, six hundred sixty-six million, three hundred fifty-four thousand, forty-one".