133873307721520 has 40 divisors (see below), whose sum is σ = 311260950483984. Its totient is φ = 53548375126272.

The previous prime is 133873307721431. The next prime is 133873307721521. The reversal of 133873307721520 is 25127703378331.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×133873307721520² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133873307721521) 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, 10255854 + ... + 19311373.

Almost surely, 2^{133873307721520} is an apocalyptic number.

133873307721520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133873307721520 is an abundant number, since it is smaller than the sum of its proper divisors (177387642762464).

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

133873307721520 is a wasteful number, since it uses less digits than its factorization.

133873307721520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29623837 (or 29623831 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 52.

The spelling of 133873307721520 in words is "one hundred thirty-three trillion, eight hundred seventy-three billion, three hundred seven million, seven hundred twenty-one thousand, five hundred twenty".