6405197609 has 8 divisors (see below), whose sum is σ = 6534308040. Its totient is φ = 6277205376.

The previous prime is 6405197599. The next prime is 6405197611. The reversal of 6405197609 is 9067915046.

It can be written as a sum of positive squares in 4 ways, for example, as 2221048384 + 4184149225 = 47128^2 + 64685^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6405197609 - 2²⁴ = 6388420393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6405197209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267974 + ... + 290895.

It is an arithmetic number, because the mean of its divisors is an integer number (816788505).

Almost surely, 2^6405197609 is an apocalyptic number.

It is an amenable number.

6405197609 is a deficient number, since it is larger than the sum of its proper divisors (129110431).

6405197609 is a wasteful number, since it uses less digits than its factorization.

6405197609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559099.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 6405197609 is about 80032.4784634338. The cubic root of 6405197609 is about 1857.1380050273.

The spelling of 6405197609 in words is "six billion, four hundred five million, one hundred ninety-seven thousand, six hundred nine".