65561806 has 4 divisors (see below), whose sum is σ = 98342712. Its totient is φ = 32780902.

The previous prime is 65561801. The next prime is 65561813. The reversal of 65561806 is 60816556.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16390450 + ... + 16390453.

It is an arithmetic number, because the mean of its divisors is an integer number (24585678).

Almost surely, 2^65561806 is an apocalyptic number.

65561806 is a deficient number, since it is larger than the sum of its proper divisors (32780906).

65561806 is a wasteful number, since it uses less digits than its factorization.

65561806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32780905.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 65561806 is about 8097.0245152155. The cubic root of 65561806 is about 403.2276481668.

The spelling of 65561806 in words is "sixty-five million, five hundred sixty-one thousand, eight hundred six".