65389138369 has 3 divisors (see below), whose sum is σ = 65389394083. Its totient is φ = 65388882656.

The previous prime is 65389138349. The next prime is 65389138393. The reversal of 65389138369 is 96383198356.

The square root of 65389138369 is 255713.

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., 62652593025 + 2736545344 = 250305^2 + 52312^2 .

It is not a de Polignac number, because 65389138369 - 2¹⁵ = 65389105601 is a prime.

It is a super-2 number, since 2×65389138369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65389138349) 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, 127857 + ... + 383569.

Almost surely, 2^65389138369 is an apocalyptic number.

65389138369 is the 255713-rd square number.

65389138369 is the 127857-th centered octagonal number.

It is an amenable number.

65389138369 is a deficient number, since it is larger than the sum of its proper divisors (255714).

65389138369 is an frugal number, since it uses more digits than its factorization.

65389138369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511426 (or 255713 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 61.

The spelling of 65389138369 in words is "sixty-five billion, three hundred eighty-nine million, one hundred thirty-eight thousand, three hundred sixty-nine".