65655520 has 144 divisors (see below), whose sum is σ = 186175584. Its totient is φ = 21427200.

The previous prime is 65655503. The next prime is 65655559. The reversal of 65655520 is 2555656.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1076290 + ... + 1076350.

It is an arithmetic number, because the mean of its divisors is an integer number (1292886).

Almost surely, 2^65655520 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 65655520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93087792).

65655520 is an abundant number, since it is smaller than the sum of its proper divisors (120520064).

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

65655520 is a wasteful number, since it uses less digits than its factorization.

65655520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 34.

The square root of 65655520 is about 8102.8093893415. The cubic root of 65655520 is about 403.4196811387.

The spelling of 65655520 in words is "sixty-five million, six hundred fifty-five thousand, five hundred twenty".