65660416 has 40 divisors (see below), whose sum is σ = 131967000. Its totient is φ = 32636928.

The previous prime is 65660369. The next prime is 65660417. The reversal of 65660416 is 61406656.

It is a super-2 number, since 2×65660416² = 8622580458586112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65660417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131335 + ... + 131833.

It is an arithmetic number, because the mean of its divisors is an integer number (3299175).

Almost surely, 2^65660416 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 65660416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65983500).

65660416 is an abundant number, since it is smaller than the sum of its proper divisors (66306584).

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

65660416 is an equidigital number, since it uses as much as digits as its factorization.

65660416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 758 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 65660416 is about 8103.1115011457. Note that the first 3 decimals coincide. The cubic root of 65660416 is about 403.4297086970.

The spelling of 65660416 in words is "sixty-five million, six hundred sixty thousand, four hundred sixteen".