65568961 has 4 divisors (see below), whose sum is σ = 66643924. Its totient is φ = 64494000.

The previous prime is 65568911. The next prime is 65568967. The reversal of 65568961 is 16986556.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21678336 + 43890625 = 4656^2 + 6625^2 .

It is a cyclic number.

It is not a de Polignac number, because 65568961 - 2¹³ = 65560769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65568967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537390 + ... + 537511.

It is an arithmetic number, because the mean of its divisors is an integer number (16660981).

Almost surely, 2^65568961 is an apocalyptic number.

65568961 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

65568961 is a deficient number, since it is larger than the sum of its proper divisors (1074963).

65568961 is a wasteful number, since it uses less digits than its factorization.

65568961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074962.

The product of its digits is 388800, while the sum is 46.

The square root of 65568961 is about 8097.4663321313. The cubic root of 65568961 is about 403.2423162032.

The spelling of 65568961 in words is "sixty-five million, five hundred sixty-eight thousand, nine hundred sixty-one".