2665720539 has 24 divisors (see below), whose sum is σ = 4229372160. Its totient is φ = 1610410032.

The previous prime is 2665720531. The next prime is 2665720559. The reversal of 2665720539 is 9350275662.

2665720539 is a `hidden beast` number, since 2 + 66 + 57 + 2 + 0 + 539 = 666.

It is not a de Polignac number, because 2665720539 - 2³ = 2665720531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2665720494 and 2665720503.

It is not an unprimeable number, because it can be changed into a prime (2665720531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 334959 + ... + 342824.

It is an arithmetic number, because the mean of its divisors is an integer number (176223840).

Almost surely, 2^2665720539 is an apocalyptic number.

2665720539 is a deficient number, since it is larger than the sum of its proper divisors (1563651621).

2665720539 is a wasteful number, since it uses less digits than its factorization.

2665720539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677831 (or 677828 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 45.

The square root of 2665720539 is about 51630.6162949853. The cubic root of 2665720539 is about 1386.5585272304.

The spelling of 2665720539 in words is "two billion, six hundred sixty-five million, seven hundred twenty thousand, five hundred thirty-nine".