133523221552464 has 160 divisors (see below), whose sum is σ = 357046067589120. Its totient is φ = 42969501388800.

The previous prime is 133523221552463. The next prime is 133523221552489. The reversal of 133523221552464 is 464255122325331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133523221552463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96538434 + ... + 97911774.

It is an arithmetic number, because the mean of its divisors is an integer number (2231537922432).

Almost surely, 2^{133523221552464} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133523221552464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178523033794560).

133523221552464 is an abundant number, since it is smaller than the sum of its proper divisors (223522846036656).

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

133523221552464 is a wasteful number, since it uses less digits than its factorization.

133523221552464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373909 (or 1373903 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 48.

Adding to 133523221552464 its reverse (464255122325331), we get a palindrome (597778343877795).

The spelling of 133523221552464 in words is "one hundred thirty-three trillion, five hundred twenty-three billion, two hundred twenty-one million, five hundred fifty-two thousand, four hundred sixty-four".