1555425311440 has 480 divisors, whose sum is σ = 4902066247680. Its totient is φ = 446624133120.

The previous prime is 1555425311437. The next prime is 1555425311513. The reversal of 1555425311440 is 441135245551.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1555425311393 and 1555425311402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 534692706 + ... + 534695614.

It is an arithmetic number, because the mean of its divisors is an integer number (10212638016).

Almost surely, 2^{1555425311440} is an apocalyptic number.

1555425311440 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 1555425311440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2451033123840).

1555425311440 is an abundant number, since it is smaller than the sum of its proper divisors (3346640936240).

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

1555425311440 is a wasteful number, since it uses less digits than its factorization.

1555425311440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571 (or 3554 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 1555425311440 in words is "one trillion, five hundred fifty-five billion, four hundred twenty-five million, three hundred eleven thousand, four hundred forty".