65561613 has 16 divisors (see below), whose sum is σ = 95469696. Its totient is φ = 39775680.

The previous prime is 65561611. The next prime is 65561651. The reversal of 65561613 is 31616556.

It is not a de Polignac number, because 65561613 - 2¹ = 65561611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9070 + ... + 14607.

It is an arithmetic number, because the mean of its divisors is an integer number (5966856).

Almost surely, 2^65561613 is an apocalyptic number.

It is an amenable number.

65561613 is a deficient number, since it is larger than the sum of its proper divisors (29908083).

65561613 is a wasteful number, since it uses less digits than its factorization.

65561613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23764.

The product of its digits is 16200, while the sum is 33.

The square root of 65561613 is about 8097.0125972484. The cubic root of 65561613 is about 403.2272524943.

The spelling of 65561613 in words is "sixty-five million, five hundred sixty-one thousand, six hundred thirteen".