65561066 has 4 divisors (see below), whose sum is σ = 98341602. Its totient is φ = 32780532.

The previous prime is 65561051. The next prime is 65561071. The reversal of 65561066 is 66016556.

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

It can be written as a sum of positive squares in only one way, i.e., 65529025 + 32041 = 8095^2 + 179^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16390265 + ... + 16390268.

Almost surely, 2^65561066 is an apocalyptic number.

65561066 is a deficient number, since it is larger than the sum of its proper divisors (32780536).

65561066 is a wasteful number, since it uses less digits than its factorization.

65561066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32780535.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 65561066 is about 8096.9788192881. The cubic root of 65561066 is about 403.2261310763.

The spelling of 65561066 in words is "sixty-five million, five hundred sixty-one thousand, sixty-six".