2065625721 has 6 divisors (see below), whose sum is σ = 2983681610. Its totient is φ = 1377083808.

The previous prime is 2065625713. The next prime is 2065625747. The reversal of 2065625721 is 1275265602.

2065625721 is a `hidden beast` number, since 2 + 0 + 6 + 5 + 625 + 7 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1999431225 + 66194496 = 44715^2 + 8136^2 .

It is not a de Polignac number, because 2065625721 - 2³ = 2065625713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2065625621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 114756976 + ... + 114756993.

Almost surely, 2^2065625721 is an apocalyptic number.

It is an amenable number.

2065625721 is a deficient number, since it is larger than the sum of its proper divisors (918055889).

2065625721 is a wasteful number, since it uses less digits than its factorization.

2065625721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229513975 (or 229513972 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 2065625721 is about 45449.1553386859. The cubic root of 2065625721 is about 1273.5535504393.

The spelling of 2065625721 in words is "two billion, sixty-five million, six hundred twenty-five thousand, seven hundred twenty-one".