155389255540 has 24 divisors (see below), whose sum is σ = 331187848992. Its totient is φ = 61228004640.

The previous prime is 155389255523. The next prime is 155389255543. The reversal of 155389255540 is 45552983551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155389255543) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 57979726 + ... + 57982405.

It is an arithmetic number, because the mean of its divisors is an integer number (13799493708).

Almost surely, 2^155389255540 is an apocalyptic number.

155389255540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155389255540 is an abundant number, since it is smaller than the sum of its proper divisors (175798593452).

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

155389255540 is a wasteful number, since it uses less digits than its factorization.

155389255540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115962207 (or 115962205 counting only the distinct ones).

The product of its (nonzero) digits is 5400000, while the sum is 52.

The spelling of 155389255540 in words is "one hundred fifty-five billion, three hundred eighty-nine million, two hundred fifty-five thousand, five hundred forty".