155581235898 has 48 divisors (see below), whose sum is σ = 342343212960. Its totient is φ = 47101491360.

The previous prime is 155581235743. The next prime is 155581235939. The reversal of 155581235898 is 898532185551.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 675861 + ... + 876327.

It is an arithmetic number, because the mean of its divisors is an integer number (7132150270).

Almost surely, 2^155581235898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155581235898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171171606480).

155581235898 is an abundant number, since it is smaller than the sum of its proper divisors (186761977062).

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

155581235898 is a wasteful number, since it uses less digits than its factorization.

155581235898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201563 (or 201552 counting only the distinct ones).

The product of its digits is 17280000, while the sum is 60.

The spelling of 155581235898 in words is "one hundred fifty-five billion, five hundred eighty-one million, two hundred thirty-five thousand, eight hundred ninety-eight".