6561465307 has 4 divisors (see below), whose sum is σ = 6565643496. Its totient is φ = 6557287120.

The previous prime is 6561465293. The next prime is 6561465397. The reversal of 6561465307 is 7035641656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6561465307 - 2⁷ = 6561465179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6561465397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2086738 + ... + 2089879.

It is an arithmetic number, because the mean of its divisors is an integer number (1641410874).

Almost surely, 2^6561465307 is an apocalyptic number.

6561465307 is a deficient number, since it is larger than the sum of its proper divisors (4178189).

6561465307 is a wasteful number, since it uses less digits than its factorization.

6561465307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4178188.

The product of its (nonzero) digits is 453600, while the sum is 43.

The square root of 6561465307 is about 81002.8722145085. The cubic root of 6561465307 is about 1872.1196956477.

The spelling of 6561465307 in words is "six billion, five hundred sixty-one million, four hundred sixty-five thousand, three hundred seven".