320663525 has 48 divisors (see below), whose sum is σ = 497884800. Its totient is φ = 199445760.

The previous prime is 320663521. The next prime is 320663531. The reversal of 320663525 is 525366023.

It is not a de Polignac number, because 320663525 - 2² = 320663521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320663491 and 320663500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320663521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133031 + ... + 135419.

It is an arithmetic number, because the mean of its divisors is an integer number (10372600).

Almost surely, 2^320663525 is an apocalyptic number.

320663525 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320663525 is a deficient number, since it is larger than the sum of its proper divisors (177221275).

320663525 is a wasteful number, since it uses less digits than its factorization.

320663525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478 (or 2473 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 32.

The square root of 320663525 is about 17907.0803036118. The cubic root of 320663525 is about 684.4628072042.

The spelling of 320663525 in words is "three hundred twenty million, six hundred sixty-three thousand, five hundred twenty-five".