65561812 has 6 divisors (see below), whose sum is σ = 114733178. Its totient is φ = 32780904.

The previous prime is 65561801. The next prime is 65561813. The reversal of 65561812 is 21816556.

It is a happy number.

65561812 is digitally balanced in base 2 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 57244356 + 8317456 = 7566^2 + 2884^2 .

65561812 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8195223 + ... + 8195230.

Almost surely, 2^65561812 is an apocalyptic number.

It is an amenable number.

65561812 is a deficient number, since it is larger than the sum of its proper divisors (49171366).

65561812 is a wasteful number, since it uses less digits than its factorization.

65561812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16390457 (or 16390455 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

The square root of 65561812 is about 8097.0248857219. The cubic root of 65561812 is about 403.2276604675.

The spelling of 65561812 in words is "sixty-five million, five hundred sixty-one thousand, eight hundred twelve".