65521633 has 4 divisors (see below), whose sum is σ = 68970160. Its totient is φ = 62073108.

The previous prime is 65521627. The next prime is 65521639. The reversal of 65521633 is 33612556.

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 an interprime number because it is at equal distance from previous prime (65521627) and next prime (65521639).

It is a cyclic number.

It is not a de Polignac number, because 65521633 - 2⁵ = 65521601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65521595 and 65521604.

It is not an unprimeable number, because it can be changed into a prime (65521639) 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, 1724235 + ... + 1724272.

It is an arithmetic number, because the mean of its divisors is an integer number (17242540).

Almost surely, 2^65521633 is an apocalyptic number.

It is an amenable number.

65521633 is a deficient number, since it is larger than the sum of its proper divisors (3448527).

65521633 is a wasteful number, since it uses less digits than its factorization.

65521633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448526.

The product of its digits is 16200, while the sum is 31.

The square root of 65521633 is about 8094.5434089886. The cubic root of 65521633 is about 403.1452720851.

The spelling of 65521633 in words is "sixty-five million, five hundred twenty-one thousand, six hundred thirty-three".