6561935073 has 6 divisors (see below), whose sum is σ = 9478350674. Its totient is φ = 4374623376.

The previous prime is 6561935069. The next prime is 6561935099. The reversal of 6561935073 is 3705391656.

6561935073 is a `hidden beast` number, since 6 + 56 + 1 + 93 + 507 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3338875089 + 3223059984 = 57783^2 + 56772^2 .

It is not a de Polignac number, because 6561935073 - 2² = 6561935069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6561935773) 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, 364551940 + ... + 364551957.

Almost surely, 2^6561935073 is an apocalyptic number.

It is an amenable number.

6561935073 is a deficient number, since it is larger than the sum of its proper divisors (2916415601).

6561935073 is a wasteful number, since it uses less digits than its factorization.

6561935073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729103903 (or 729103900 counting only the distinct ones).

The product of its (nonzero) digits is 510300, while the sum is 45.

The square root of 6561935073 is about 81005.7718499120. The cubic root of 6561935073 is about 1872.1643725175.

The spelling of 6561935073 in words is "six billion, five hundred sixty-one million, nine hundred thirty-five thousand, seventy-three".