65516561 has 8 divisors (see below), whose sum is σ = 71569344. Its totient is φ = 59479920.

The previous prime is 65516557. The next prime is 65516567. The reversal of 65516561 is 16561556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65516561 - 2² = 65516557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65516567) 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, 5435 + ... + 12671.

It is an arithmetic number, because the mean of its divisors is an integer number (8946168).

Almost surely, 2^65516561 is an apocalyptic number.

It is an amenable number.

65516561 is a deficient number, since it is larger than the sum of its proper divisors (6052783).

65516561 is a wasteful number, since it uses less digits than its factorization.

65516561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8071.

The product of its digits is 27000, while the sum is 35.

The square root of 65516561 is about 8094.2301054517. The cubic root of 65516561 is about 403.1348693856.

The spelling of 65516561 in words is "sixty-five million, five hundred sixteen thousand, five hundred sixty-one".