65413689121 has 9 divisors (see below), whose sum is σ = 71904089649. Its totient is φ = 59464432500.

The previous prime is 65413689073. The next prime is 65413689149. The reversal of 65413689121 is 12198631456.

The square root of 65413689121 is 255761.

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

It is not a de Polignac number, because 65413689121 - 2¹³ = 65413680929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65413689161) 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, 2801746 + ... + 2824996.

Almost surely, 2^65413689121 is an apocalyptic number.

65413689121 is the 255761-st square number.

65413689121 is the 127881-st centered octagonal number.

It is an amenable number.

65413689121 is a deficient number, since it is larger than the sum of its proper divisors (6490400528).

65413689121 is an frugal number, since it uses more digits than its factorization.

65413689121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46524 (or 23262 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The spelling of 65413689121 in words is "sixty-five billion, four hundred thirteen million, six hundred eighty-nine thousand, one hundred twenty-one".