155535032304440 has 128 divisors (see below), whose sum is σ = 371131176456000. Its totient is φ = 58460884500480.

The previous prime is 155535032304437. The next prime is 155535032304473. The reversal of 155535032304440 is 44403230535551.

It is a super-2 number, since 2×155535032304440² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155535032304391 and 155535032304400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1913082911 + ... + 1913164209.

Almost surely, 2^{155535032304440} is an apocalyptic number.

155535032304440 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 155535032304440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185565588228000).

155535032304440 is an abundant number, since it is smaller than the sum of its proper divisors (215596144151560).

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

155535032304440 is a wasteful number, since it uses less digits than its factorization.

155535032304440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85785 (or 85781 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 44.

Adding to 155535032304440 its reverse (44403230535551), we get a palindrome (199938262839991).

The spelling of 155535032304440 in words is "one hundred fifty-five trillion, five hundred thirty-five billion, thirty-two million, three hundred four thousand, four hundred forty".