65205154609 has 9 divisors (see below), whose sum is σ = 75852973497. Its totient is φ = 55888600404.

The previous prime is 65205154591. The next prime is 65205154657. The reversal of 65205154609 is 90645150256.

The square root of 65205154609 is 255353.

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

It is not a de Polignac number, because 65205154609 - 2¹¹ = 65205152561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65205154909) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1769232 + ... + 1805710.

Almost surely, 2^65205154609 is an apocalyptic number.

65205154609 is the 255353-rd square number.

65205154609 is the 127677-th centered octagonal number.

It is an amenable number.

65205154609 is a deficient number, since it is larger than the sum of its proper divisors (10647818888).

65205154609 is an frugal number, since it uses more digits than its factorization.

65205154609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72972 (or 36486 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 65205154609 in words is "sixty-five billion, two hundred five million, one hundred fifty-four thousand, six hundred nine".