30725436560809 has 3 divisors (see below), whose sum is σ = 30725442103863. Its totient is φ = 30725431017756.

The previous prime is 30725436560803. The next prime is 30725436560821. The reversal of 30725436560809 is 90806563452703.

The square root of 30725436560809 is 5543053.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 21998304355225 + 8727132205584 = 4690235^2 + 2954172^2 .

It is not a de Polignac number, because 30725436560809 - 2²⁷ = 30725302343081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30725436560803) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2771527 + ... + 8314579.

It is an arithmetic number, because the mean of its divisors is an integer number (10241814034621).

Almost surely, 2^{30725436560809} is an apocalyptic number.

30725436560809 is the 5543053-rd square number.

30725436560809 is the 2771527-th centered octagonal number.

It is an amenable number.

30725436560809 is a deficient number, since it is larger than the sum of its proper divisors (5543054).

30725436560809 is an frugal number, since it uses more digits than its factorization.

30725436560809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11086106 (or 5543053 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 58.

The spelling of 30725436560809 in words is "thirty trillion, seven hundred twenty-five billion, four hundred thirty-six million, five hundred sixty thousand, eight hundred nine".