133720231525155 has 48 divisors (see below), whose sum is σ = 254051156136960. Its totient is φ = 64526781211200.

The previous prime is 133720231525151. The next prime is 133720231525157. The reversal of 133720231525155 is 551525132027331.

133720231525155 is a `hidden beast` number, since 1 + 3 + 3 + 72 + 0 + 2 + 3 + 1 + 525 + 1 + 55 = 666.

It is not a de Polignac number, because 133720231525155 - 2² = 133720231525151 is a prime.

It is a super-4 number, since 4×133720231525155⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 133720231525155.

It is not an unprimeable number, because it can be changed into a prime (133720231525151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 640042195 + ... + 640251084.

It is an arithmetic number, because the mean of its divisors is an integer number (5292732419520).

Almost surely, 2^{133720231525155} is an apocalyptic number.

133720231525155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

133720231525155 is a deficient number, since it is larger than the sum of its proper divisors (120330924611805).

133720231525155 is a wasteful number, since it uses less digits than its factorization.

133720231525155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280293512 (or 1280293509 counting only the distinct ones).

The product of its (nonzero) digits is 945000, while the sum is 45.

The spelling of 133720231525155 in words is "one hundred thirty-three trillion, seven hundred twenty billion, two hundred thirty-one million, five hundred twenty-five thousand, one hundred fifty-five".