2655575721 has 6 divisors (see below), whose sum is σ = 3835831610. Its totient is φ = 1770383808.

The previous prime is 2655575711. The next prime is 2655575743. The reversal of 2655575721 is 1275755562.

2655575721 is a `hidden beast` number, since 2 + 6 + 5 + 5 + 575 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2558336400 + 97239321 = 50580^2 + 9861^2 .

It is not a de Polignac number, because 2655575721 - 2²² = 2651381417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2655575711) 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 5 ways as a sum of consecutive naturals, for example, 147531976 + ... + 147531993.

Almost surely, 2^2655575721 is an apocalyptic number.

It is an amenable number.

2655575721 is a deficient number, since it is larger than the sum of its proper divisors (1180255889).

2655575721 is a wasteful number, since it uses less digits than its factorization.

2655575721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295063975 (or 295063972 counting only the distinct ones).

The product of its digits is 735000, while the sum is 45.

The square root of 2655575721 is about 51532.2784378878. The cubic root of 2655575721 is about 1384.7973691663.

The spelling of 2655575721 in words is "two billion, six hundred fifty-five million, five hundred seventy-five thousand, seven hundred twenty-one".