1555145015540 has 96 divisors (see below), whose sum is σ = 3511730073600. Its totient is φ = 576631785600.

The previous prime is 1555145015513. The next prime is 1555145015549. The reversal of 1555145015540 is 455105415551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555145015549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90202241 + ... + 90219479.

It is an arithmetic number, because the mean of its divisors is an integer number (36580521600).

Almost surely, 2^{1555145015540} is an apocalyptic number.

1555145015540 is a gapful number since it is divisible by the number (10) 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 1555145015540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1755865036800).

1555145015540 is an abundant number, since it is smaller than the sum of its proper divisors (1956585058060).

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

1555145015540 is a wasteful number, since it uses less digits than its factorization.

1555145015540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22365 (or 22363 counting only the distinct ones).

The product of its (nonzero) digits is 250000, while the sum is 41.

The spelling of 1555145015540 in words is "one trillion, five hundred fifty-five billion, one hundred forty-five million, fifteen thousand, five hundred forty".