133581661586856 has 192 divisors, whose sum is σ = 421714191525120. Its totient is φ = 37411128760320.

The previous prime is 133581661586839. The next prime is 133581661586861. The reversal of 133581661586856 is 658685166185331.

133581661586856 is a `hidden beast` number, since 1 + 3 + 35 + 8 + 1 + 6 + 6 + 1 + 586 + 8 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4598385 + ... + 16979648.

It is an arithmetic number, because the mean of its divisors is an integer number (2196428080860).

Almost surely, 2^{133581661586856} is an apocalyptic number.

It is an amenable number.

133581661586856 is an abundant number, since it is smaller than the sum of its proper divisors (288132529938264).

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

133581661586856 is a wasteful number, since it uses less digits than its factorization.

133581661586856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21578296 (or 21578289 counting only the distinct ones).

The product of its digits is 746496000, while the sum is 72.

The spelling of 133581661586856 in words is "one hundred thirty-three trillion, five hundred eighty-one billion, six hundred sixty-one million, five hundred eighty-six thousand, eight hundred fifty-six".