1618844680656 has 120 divisors (see below), whose sum is σ = 5283401572800. Its totient is φ = 462527037504.

The previous prime is 1618844680637. The next prime is 1618844680693. The reversal of 1618844680656 is 6560864488161.

1618844680656 is a `hidden beast` number, since 1 + 6 + 188 + 446 + 8 + 0 + 6 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 1618844680593 and 1618844680602.

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 23 ways as a sum of consecutive naturals, for example, 16338330 + ... + 16437113.

It is an arithmetic number, because the mean of its divisors is an integer number (44028346440).

Almost surely, 2^{1618844680656} is an apocalyptic number.

1618844680656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1618844680656 is an abundant number, since it is smaller than the sum of its proper divisors (3664556892144).

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

1618844680656 is a wasteful number, since it uses less digits than its factorization.

1618844680656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32775478 (or 32775455 counting only the distinct ones).

The product of its (nonzero) digits is 53084160, while the sum is 63.

The spelling of 1618844680656 in words is "one trillion, six hundred eighteen billion, eight hundred forty-four million, six hundred eighty thousand, six hundred fifty-six".