133866628381 has 16 divisors (see below), whose sum is σ = 135000391680. Its totient is φ = 132739271280.

The previous prime is 133866628283. The next prime is 133866628403. The reversal of 133866628381 is 183826668331.

It is a cyclic number.

It is not a de Polignac number, because 133866628381 - 2¹⁹ = 133866104093 is a prime.

It is a super-2 number, since 2×133866628381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (5971968) is a multiple of the sum of its prime divisors (3456).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133866625381) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 59787460 + ... + 59789698.

It is an arithmetic number, because the mean of its divisors is an integer number (8437524480).

Almost surely, 2^133866628381 is an apocalyptic number.

It is an amenable number.

133866628381 is a deficient number, since it is larger than the sum of its proper divisors (1133763299).

133866628381 is a wasteful number, since it uses less digits than its factorization.

133866628381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456.

The product of its digits is 5971968, while the sum is 55.

The spelling of 133866628381 in words is "one hundred thirty-three billion, eight hundred sixty-six million, six hundred twenty-eight thousand, three hundred eighty-one".