65511768 has 64 divisors (see below), whose sum is σ = 191761920. Its totient is φ = 18259200.

The previous prime is 65511757. The next prime is 65511779. The reversal of 65511768 is 86711556.

It is an interprime number because it is at equal distance from previous prime (65511757) and next prime (65511779).

It is a congruent number.

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, 2133 + ... + 11643.

It is an arithmetic number, because the mean of its divisors is an integer number (2996280).

Almost surely, 2^65511768 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 65511768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95880960).

65511768 is an abundant number, since it is smaller than the sum of its proper divisors (126250152).

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

65511768 is a wasteful number, since it uses less digits than its factorization.

65511768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9568 (or 9564 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The square root of 65511768 is about 8093.9340249350. The cubic root of 65511768 is about 403.1250384232.

The spelling of 65511768 in words is "sixty-five million, five hundred eleven thousand, seven hundred sixty-eight".