133565356661 has 8 divisors (see below), whose sum is σ = 145723147200. Its totient is φ = 121410147040.

The previous prime is 133565356649. The next prime is 133565356669. The reversal of 133565356661 is 166653565331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133565356661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133565356669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536216 + ... + 744753.

It is an arithmetic number, because the mean of its divisors is an integer number (18215393400).

Almost surely, 2^133565356661 is an apocalyptic number.

133565356661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133565356661 is a deficient number, since it is larger than the sum of its proper divisors (12157790539).

133565356661 is a wasteful number, since it uses less digits than its factorization.

133565356661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290459.

The product of its digits is 4374000, while the sum is 50.

The spelling of 133565356661 in words is "one hundred thirty-three billion, five hundred sixty-five million, three hundred fifty-six thousand, six hundred sixty-one".