65261616 has 80 divisors (see below), whose sum is σ = 197201664. Its totient is φ = 18208512.

The previous prime is 65261597. The next prime is 65261633. The reversal of 65261616 is 61616256.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12190 + ... + 16706.

Almost surely, 2^65261616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65261616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98600832).

65261616 is an abundant number, since it is smaller than the sum of its proper divisors (131940048).

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

65261616 is a wasteful number, since it uses less digits than its factorization.

65261616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578 (or 4572 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 65261616 is about 8078.4661910538. The cubic root of 65261616 is about 402.6112825795.

The spelling of 65261616 in words is "sixty-five million, two hundred sixty-one thousand, six hundred sixteen".