155531013440 has 56 divisors (see below), whose sum is σ = 404027164512. Its totient is φ = 56556730880.

The previous prime is 155531013437. The next prime is 155531013457. The reversal of 155531013440 is 44310135551.

155531013440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155531013440² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 155531013397 and 155531013406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22088954 + ... + 22095993.

Almost surely, 2^155531013440 is an apocalyptic number.

155531013440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155531013440 is an abundant number, since it is smaller than the sum of its proper divisors (248496151072).

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

155531013440 is a wasteful number, since it uses less digits than its factorization.

155531013440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44184975 (or 44184965 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 155531013440 its reverse (44310135551), we get a palindrome (199841148991).

The spelling of 155531013440 in words is "one hundred fifty-five billion, five hundred thirty-one million, thirteen thousand, four hundred forty".