1341666261 has 20 divisors (see below), whose sum is σ = 2158389772. Its totient is φ = 825640128.

The previous prime is 1341666241. The next prime is 1341666317. The reversal of 1341666261 is 1626661431.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 377563761 + 964102500 = 19431^2 + 31050^2 .

It is not a de Polignac number, because 1341666261 - 2⁵ = 1341666229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1341666211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 636016 + ... + 638121.

Almost surely, 2^1341666261 is an apocalyptic number.

It is an amenable number.

1341666261 is a deficient number, since it is larger than the sum of its proper divisors (816723511).

1341666261 is a wasteful number, since it uses less digits than its factorization.

1341666261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274162 (or 1274153 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 1341666261 is about 36628.7627555177. The cubic root of 1341666261 is about 1102.9305495959.

The spelling of 1341666261 in words is "one billion, three hundred forty-one million, six hundred sixty-six thousand, two hundred sixty-one".