1556982780940 has 48 divisors (see below), whose sum is σ = 3350464508160. Its totient is φ = 607563669440.

The previous prime is 1556982780887. The next prime is 1556982780943. The reversal of 1556982780940 is 490872896551.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1556982780943) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4881592 + ... + 5190751.

It is an arithmetic number, because the mean of its divisors is an integer number (69801343920).

Almost surely, 2^{1556982780940} is an apocalyptic number.

1556982780940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1556982780940 is an abundant number, since it is smaller than the sum of its proper divisors (1793481727220).

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

1556982780940 is a wasteful number, since it uses less digits than its factorization.

1556982780940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10072542 (or 10072540 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 64.

The spelling of 1556982780940 in words is "one trillion, five hundred fifty-six billion, nine hundred eighty-two million, seven hundred eighty thousand, nine hundred forty".