65524821 has 4 divisors (see below), whose sum is σ = 87366432. Its totient is φ = 43683212.

The previous prime is 65524813. The next prime is 65524841. The reversal of 65524821 is 12842556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65524821 - 2³ = 65524813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65524841) 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, 10920801 + ... + 10920806.

It is an arithmetic number, because the mean of its divisors is an integer number (21841608).

Almost surely, 2^65524821 is an apocalyptic number.

It is an amenable number.

65524821 is a deficient number, since it is larger than the sum of its proper divisors (21841611).

65524821 is a wasteful number, since it uses less digits than its factorization.

65524821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21841610.

The product of its digits is 19200, while the sum is 33.

The square root of 65524821 is about 8094.7403293744. The cubic root of 65524821 is about 403.1518104157.

The spelling of 65524821 in words is "sixty-five million, five hundred twenty-four thousand, eight hundred twenty-one".