65499521 has 4 divisors (see below), whose sum is σ = 69352452. Its totient is φ = 61646592.

The previous prime is 65499493. The next prime is 65499523. The reversal of 65499521 is 12599456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49210225 + 16289296 = 7015^2 + 4036^2 .

It is a cyclic number.

It is not a de Polignac number, because 65499521 - 2¹⁰ = 65498497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65499523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1926440 + ... + 1926473.

It is an arithmetic number, because the mean of its divisors is an integer number (17338113).

Almost surely, 2^65499521 is an apocalyptic number.

It is an amenable number.

65499521 is a deficient number, since it is larger than the sum of its proper divisors (3852931).

65499521 is a wasteful number, since it uses less digits than its factorization.

65499521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3852930.

The product of its digits is 97200, while the sum is 41.

The square root of 65499521 is about 8093.1774353464. The cubic root of 65499521 is about 403.0999163208.

The spelling of 65499521 in words is "sixty-five million, four hundred ninety-nine thousand, five hundred twenty-one".