1556655561120 has 384 divisors, whose sum is σ = 5572513013760. Its totient is φ = 361843200000.

The previous prime is 1556655561113. The next prime is 1556655561137. The reversal of 1556655561120 is 211655566551.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1556655561120.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 17797495 + ... + 17884745.

It is an arithmetic number, because the mean of its divisors is an integer number (14511752640).

Almost surely, 2^{1556655561120} is an apocalyptic number.

1556655561120 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 1556655561120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2786256506880).

1556655561120 is an abundant number, since it is smaller than the sum of its proper divisors (4015857452640).

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

1556655561120 is a wasteful number, since it uses less digits than its factorization.

1556655561120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87420 (or 87412 counting only the distinct ones).

The product of its (nonzero) digits is 1350000, while the sum is 48.

The spelling of 1556655561120 in words is "one trillion, five hundred fifty-six billion, six hundred fifty-five million, five hundred sixty-one thousand, one hundred twenty".