525321664 has 56 divisors (see below), whose sum is σ = 1193698400. Its totient is φ = 224695296.

The previous prime is 525321661. The next prime is 525321677. The reversal of 525321664 is 466123525.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525321661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338362 + ... + 339910.

Almost surely, 2^525321664 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 525321664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (596849200).

525321664 is an abundant number, since it is smaller than the sum of its proper divisors (668376736).

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

525321664 is a wasteful number, since it uses less digits than its factorization.

525321664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325 (or 2315 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

The square root of 525321664 is about 22919.8966838858. The cubic root of 525321664 is about 806.8790455379.

The spelling of 525321664 in words is "five hundred twenty-five million, three hundred twenty-one thousand, six hundred sixty-four".