65861616 has 40 divisors (see below), whose sum is σ = 173359440. Its totient is φ = 21538816.

The previous prime is 65861611. The next prime is 65861629. The reversal of 65861616 is 61616856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65861611) 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, 10401 + ... + 15488.

It is an arithmetic number, because the mean of its divisors is an integer number (4333986).

Almost surely, 2^65861616 is an apocalyptic number.

It is an amenable number.

65861616 is an abundant number, since it is smaller than the sum of its proper divisors (107497824).

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

65861616 is a wasteful number, since it uses less digits than its factorization.

65861616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25953 (or 25947 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 65861616 is about 8115.5169890772. The cubic root of 65861616 is about 403.8413584890.

The spelling of 65861616 in words is "sixty-five million, eight hundred sixty-one thousand, six hundred sixteen".