155055221104 has 80 divisors (see below), whose sum is σ = 345547312128. Its totient is φ = 66025230336.

The previous prime is 155055221093. The next prime is 155055221107. The reversal of 155055221104 is 401122550551.

It is a super-3 number, since 3×155055221104³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155055221107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19169349 + ... + 19177435.

Almost surely, 2^155055221104 is an apocalyptic number.

155055221104 is a gapful number since it is divisible by the number (14) 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 155055221104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172773656064).

155055221104 is an abundant number, since it is smaller than the sum of its proper divisors (190492091024).

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

155055221104 is a wasteful number, since it uses less digits than its factorization.

155055221104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9182 (or 9176 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 31.

Adding to 155055221104 its reverse (401122550551), we get a palindrome (556177771655).

The spelling of 155055221104 in words is "one hundred fifty-five billion, fifty-five million, two hundred twenty-one thousand, one hundred four".