133281440660 has 12 divisors (see below), whose sum is σ = 279891025428. Its totient is φ = 53312576256.

The previous prime is 133281440627. The next prime is 133281440689. The reversal of 133281440660 is 66044182331.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 93139715344 + 40141725316 = 305188^2 + 200354^2 .

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, 3332035997 + ... + 3332036036.

It is an arithmetic number, because the mean of its divisors is an integer number (23324252119).

Almost surely, 2^133281440660 is an apocalyptic number.

133281440660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133281440660 is an abundant number, since it is smaller than the sum of its proper divisors (146609584768).

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

133281440660 is a wasteful number, since it uses less digits than its factorization.

133281440660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6664072042 (or 6664072040 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The spelling of 133281440660 in words is "one hundred thirty-three billion, two hundred eighty-one million, four hundred forty thousand, six hundred sixty".