133561206720 has 224 divisors, whose sum is σ = 473256864000. Its totient is φ = 35458900992.

The previous prime is 133561206689. The next prime is 133561206731. The reversal of 133561206720 is 27602165331.

133561206720 is a `hidden beast` number, since 1 + 3 + 3 + 561 + 20 + 6 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1927231 + ... + 1995329.

Almost surely, 2^133561206720 is an apocalyptic number.

133561206720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133561206720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236628432000).

133561206720 is an abundant number, since it is smaller than the sum of its proper divisors (339695657280).

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

133561206720 is a wasteful number, since it uses less digits than its factorization.

133561206720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68352 (or 68336 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 133561206720 in words is "one hundred thirty-three billion, five hundred sixty-one million, two hundred six thousand, seven hundred twenty".