133721147556 has 36 divisors (see below), whose sum is σ = 341815301100. Its totient is φ = 44072886528.

The previous prime is 133721147473. The next prime is 133721147563. The reversal of 133721147556 is 655741127331.

133721147556 is a `hidden beast` number, since 1 + 3 + 37 + 21 + 1 + 47 + 556 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 29366305956 + 104354841600 = 171366^2 + 323040^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20864641 + ... + 20871048.

It is an arithmetic number, because the mean of its divisors is an integer number (9494869475).

Almost surely, 2^133721147556 is an apocalyptic number.

It is an amenable number.

133721147556 is an abundant number, since it is smaller than the sum of its proper divisors (208094153544).

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

133721147556 is a wasteful number, since it uses less digits than its factorization.

133721147556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41735788 (or 41735783 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The spelling of 133721147556 in words is "one hundred thirty-three billion, seven hundred twenty-one million, one hundred forty-seven thousand, five hundred fifty-six".