133165520 has 20 divisors (see below), whose sum is σ = 309610020. Its totient is φ = 53266176.

The previous prime is 133165519. The next prime is 133165531. The reversal of 133165520 is 25561331.

133165520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 100080016 + 33085504 = 10004^2 + 5752^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 133165520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832205 + ... + 832364.

It is an arithmetic number, because the mean of its divisors is an integer number (15480501).

Almost surely, 2^133165520 is an apocalyptic number.

133165520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133165520 is an abundant number, since it is smaller than the sum of its proper divisors (176444500).

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

133165520 is a wasteful number, since it uses less digits than its factorization.

133165520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664582 (or 1664576 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 133165520 is about 11539.7365654507. The cubic root of 133165520 is about 510.6585367146.

The spelling of 133165520 in words is "one hundred thirty-three million, one hundred sixty-five thousand, five hundred twenty".