65521423 has 4 divisors (see below), whose sum is σ = 71477928. Its totient is φ = 59564920.

The previous prime is 65521399. The next prime is 65521429. The reversal of 65521423 is 32412556.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65521423 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 65521391 and 65521400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65521429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2978236 + ... + 2978257.

It is an arithmetic number, because the mean of its divisors is an integer number (17869482).

Almost surely, 2^65521423 is an apocalyptic number.

65521423 is a deficient number, since it is larger than the sum of its proper divisors (5956505).

65521423 is a wasteful number, since it uses less digits than its factorization.

65521423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5956504.

The product of its digits is 7200, while the sum is 28.

The square root of 65521423 is about 8094.5304372768. The cubic root of 65521423 is about 403.1448413846.

Adding to 65521423 its reverse (32412556), we get a palindrome (97933979).

The spelling of 65521423 in words is "sixty-five million, five hundred twenty-one thousand, four hundred twenty-three".