155134255440 has 80 divisors (see below), whose sum is σ = 489067358400. Its totient is φ = 40667959296.

The previous prime is 155134255439. The next prime is 155134255511. The reversal of 155134255440 is 44552431551.

It is a tau number, because it is divible by the number of its divisors (80).

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, 5463745 + ... + 5492064.

It is an arithmetic number, because the mean of its divisors is an integer number (6113341980).

Almost surely, 2^155134255440 is an apocalyptic number.

155134255440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155134255440 is an abundant number, since it is smaller than the sum of its proper divisors (333933102960).

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

155134255440 is a wasteful number, since it uses less digits than its factorization.

155134255440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10955884 (or 10955878 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 39.

Adding to 155134255440 its reverse (44552431551), we get a palindrome (199686686991).

The spelling of 155134255440 in words is "one hundred fifty-five billion, one hundred thirty-four million, two hundred fifty-five thousand, four hundred forty".