2055660261 has 4 divisors (see below), whose sum is σ = 2740880352. Its totient is φ = 1370440172.

The previous prime is 2055660221. The next prime is 2055660263. The reversal of 2055660261 is 1620665502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2055660261 - 2⁷ = 2055660133 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2055660263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342610041 + ... + 342610046.

It is an arithmetic number, because the mean of its divisors is an integer number (685220088).

Almost surely, 2^2055660261 is an apocalyptic number.

It is an amenable number.

2055660261 is a deficient number, since it is larger than the sum of its proper divisors (685220091).

2055660261 is an equidigital number, since it uses as much as digits as its factorization.

2055660261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685220090.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 2055660261 is about 45339.3897290204. The cubic root of 2055660261 is about 1271.5021927437.

The spelling of 2055660261 in words is "two billion, fifty-five million, six hundred sixty thousand, two hundred sixty-one".