133565056 has 32 divisors (see below), whose sum is σ = 281743380. Its totient is φ = 62853120.

The previous prime is 133565027. The next prime is 133565057. The reversal of 133565056 is 650565331.

It can be written as a sum of positive squares in 2 ways, for example, as 130325056 + 3240000 = 11416^2 + 1800^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (133565057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28515 + ... + 32866.

Almost surely, 2^133565056 is an apocalyptic number.

133565056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

133565056 is an abundant number, since it is smaller than the sum of its proper divisors (148178324).

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

133565056 is an equidigital number, since it uses as much as digits as its factorization.

133565056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61412 (or 61400 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 34.

The square root of 133565056 is about 11557.0349138523. The cubic root of 133565056 is about 511.1687357560.

The spelling of 133565056 in words is "one hundred thirty-three million, five hundred sixty-five thousand, fifty-six".