2655190721 has 2 divisors, whose sum is σ = 2655190722. Its totient is φ = 2655190720.

The previous prime is 2655190691. The next prime is 2655190793. The reversal of 2655190721 is 1270915562.

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., 2377635121 + 277555600 = 48761^2 + 16660^2 .

It is a cyclic number.

It is not a de Polignac number, because 2655190721 - 2²⁶ = 2588081857 is a prime.

It is not a weakly prime, because it can be changed into another prime (2655195721) 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 as a sum of consecutive naturals, namely, 1327595360 + 1327595361.

It is an arithmetic number, because the mean of its divisors is an integer number (1327595361).

Almost surely, 2^2655190721 is an apocalyptic number.

It is an amenable number.

2655190721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2655190721 is an equidigital number, since it uses as much as digits as its factorization.

2655190721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 2655190721 is about 51528.5427797061. The cubic root of 2655190721 is about 1384.7304442242.

The spelling of 2655190721 in words is "two billion, six hundred fifty-five million, one hundred ninety thousand, seven hundred twenty-one".