65525520 has 160 divisors (see below), whose sum is σ = 214414848. Its totient is φ = 16533504.

The previous prime is 65525519. The next prime is 65525521. The reversal of 65525520 is 2552556.

It is an interprime number because it is at equal distance from previous prime (65525519) and next prime (65525521).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (65525521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 417282 + ... + 417438.

Almost surely, 2^65525520 is an apocalyptic number.

65525520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65525520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107207424).

65525520 is an abundant number, since it is smaller than the sum of its proper divisors (148889328).

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

65525520 is a wasteful number, since it uses less digits than its factorization.

65525520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The square root of 65525520 is about 8094.7835054435. The cubic root of 65525520 is about 403.1532439799.

The spelling of 65525520 in words is "sixty-five million, five hundred twenty-five thousand, five hundred twenty".