133895891840 has 64 divisors (see below), whose sum is σ = 321469022160. Its totient is φ = 53328433152.

The previous prime is 133895891837. The next prime is 133895891863. The reversal of 133895891840 is 48198598331.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 133895891840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299834 + ... + 598073.

Almost surely, 2^133895891840 is an apocalyptic number.

133895891840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133895891840 is an abundant number, since it is smaller than the sum of its proper divisors (187573130320).

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

133895891840 is an equidigital number, since it uses as much as digits as its factorization.

133895891840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898159 (or 898147 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 59.

The spelling of 133895891840 in words is "one hundred thirty-three billion, eight hundred ninety-five million, eight hundred ninety-one thousand, eight hundred forty".