133155320440 has 64 divisors (see below), whose sum is σ = 315612612000. Its totient is φ = 50419699200.

The previous prime is 133155320399. The next prime is 133155320477. The reversal of 133155320440 is 44023551331.

It is a super-3 number, since 3×133155320440³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 921426 + ... + 1056094.

Almost surely, 2^133155320440 is an apocalyptic number.

133155320440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133155320440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157806306000).

133155320440 is an abundant number, since it is smaller than the sum of its proper divisors (182457291560).

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

133155320440 is a wasteful number, since it uses less digits than its factorization.

133155320440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136000 (or 135996 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 133155320440 its reverse (44023551331), we get a palindrome (177178871771).

The spelling of 133155320440 in words is "one hundred thirty-three billion, one hundred fifty-five million, three hundred twenty thousand, four hundred forty".