65540633 has 6 divisors (see below), whose sum is σ = 69172074. Its totient is φ = 62090784.

The previous prime is 65540623. The next prime is 65540647. The reversal of 65540633 is 33604556.

It can be written as a sum of positive squares in only one way, i.e., 55472704 + 10067929 = 7448^2 + 3173^2 .

It is not a de Polignac number, because 65540633 - 2²⁴ = 48763417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 65540633.

It is not an unprimeable number, because it can be changed into a prime (65540623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90416 + ... + 91137.

It is an arithmetic number, because the mean of its divisors is an integer number (11528679).

Almost surely, 2^65540633 is an apocalyptic number.

It is an amenable number.

65540633 is a deficient number, since it is larger than the sum of its proper divisors (3631441).

65540633 is a wasteful number, since it uses less digits than its factorization.

65540633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181591 (or 181572 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 32.

The square root of 65540633 is about 8095.7169540443. The cubic root of 65540633 is about 403.1842364167.

The spelling of 65540633 in words is "sixty-five million, five hundred forty thousand, six hundred thirty-three".