1556002643120 has 20 divisors (see below), whose sum is σ = 3617706145440. Its totient is φ = 622401057216.

The previous prime is 1556002643099. The next prime is 1556002643141. The reversal of 1556002643120 is 213462006551.

It is an interprime number because it is at equal distance from previous prime (1556002643099) and next prime (1556002643141).

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1556002643120² (a number of 25 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 9725016440 + ... + 9725016599.

It is an arithmetic number, because the mean of its divisors is an integer number (180885307272).

Almost surely, 2^{1556002643120} is an apocalyptic number.

1556002643120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1556002643120 is an abundant number, since it is smaller than the sum of its proper divisors (2061703502320).

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

1556002643120 is a wasteful number, since it uses less digits than its factorization.

1556002643120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19450033052 (or 19450033046 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 1556002643120 its reverse (213462006551), we get a palindrome (1769464649671).

The spelling of 1556002643120 in words is "one trillion, five hundred fifty-six billion, two million, six hundred forty-three thousand, one hundred twenty".