65205616 has 40 divisors (see below), whose sum is σ = 144777440. Its totient is φ = 27869184.

The previous prime is 65205611. The next prime is 65205641. The reversal of 65205616 is 61650256.

65205616 = 4² + 5² + ... + 580².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65205611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64120 + ... + 65128.

It is an arithmetic number, because the mean of its divisors is an integer number (3619436).

Almost surely, 2^65205616 is an apocalyptic number.

It is an amenable number.

65205616 is an abundant number, since it is smaller than the sum of its proper divisors (79571824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65205616 is a wasteful number, since it uses less digits than its factorization.

65205616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601 (or 1595 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 65205616 is about 8074.9994427244. Note that the first 3 decimals coincide. The cubic root of 65205616 is about 402.4960914194.

The spelling of 65205616 in words is "sixty-five million, two hundred five thousand, six hundred sixteen".