275601661 has 2 divisors, whose sum is σ = 275601662. Its totient is φ = 275601660.

The previous prime is 275601647. The next prime is 275601701. The reversal of 275601661 is 166106572.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 258212761 + 17388900 = 16069^2 + 4170^2 .

It is a cyclic number.

It is not a de Polignac number, because 275601661 - 2⁹ = 275601149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (275601611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137800830 + 137800831.

It is an arithmetic number, because the mean of its divisors is an integer number (137800831).

Almost surely, 2^275601661 is an apocalyptic number.

It is an amenable number.

275601661 is a deficient number, since it is larger than the sum of its proper divisors (1).

275601661 is an equidigital number, since it uses as much as digits as its factorization.

275601661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 275601661 is about 16601.2548019720. The cubic root of 275601661 is about 650.7696295868.

The spelling of 275601661 in words is "two hundred seventy-five million, six hundred one thousand, six hundred sixty-one".