653838811609 has 3 divisors (see below), whose sum is σ = 653839620213. Its totient is φ = 653838003006.

The previous prime is 653838811601. The next prime is 653838811657. The reversal of 653838811609 is 906118838356.

The square root of 653838811609 is 808603.

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 is not a de Polignac number, because 653838811609 - 2³ = 653838811601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653838811601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 404302 + ... + 1212904.

It is an arithmetic number, because the mean of its divisors is an integer number (217946540071).

Almost surely, 2^653838811609 is an apocalyptic number.

653838811609 is the 808603-rd square number.

653838811609 is the 404302-nd centered octagonal number.

It is an amenable number.

653838811609 is a deficient number, since it is larger than the sum of its proper divisors (808604).

653838811609 is an frugal number, since it uses more digits than its factorization.

653838811609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617206 (or 808603 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 58.

The spelling of 653838811609 in words is "six hundred fifty-three billion, eight hundred thirty-eight million, eight hundred eleven thousand, six hundred nine".