133664135506421 has 16 divisors (see below), whose sum is σ = 144013628420928. Its totient is φ = 123324308688000.

The previous prime is 133664135506381. The next prime is 133664135506457. The reversal of 133664135506421 is 124605531466331.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133664135506421 is a prime.

It is a super-2 number, since 2×133664135506421² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133664135506421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133664134506421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1154099606 + ... + 1154215416.

It is an arithmetic number, because the mean of its divisors is an integer number (9000851776308).

Almost surely, 2^{133664135506421} is an apocalyptic number.

It is an amenable number.

133664135506421 is a deficient number, since it is larger than the sum of its proper divisors (10349492914507).

133664135506421 is a wasteful number, since it uses less digits than its factorization.

133664135506421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156772.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 133664135506421 in words is "one hundred thirty-three trillion, six hundred sixty-four billion, one hundred thirty-five million, five hundred six thousand, four hundred twenty-one".