1555666600656 has 80 divisors (see below), whose sum is σ = 4618579392000. Its totient is φ = 441993047424.

The previous prime is 1555666600643. The next prime is 1555666600687. The reversal of 1555666600656 is 6560066665551.

It is a junction number, because it is equal to n+sod(n) for n = 1555666600596 and 1555666600605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12872706 + ... + 12992993.

It is an arithmetic number, because the mean of its divisors is an integer number (57732242400).

Almost surely, 2^{1555666600656} is an apocalyptic number.

1555666600656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1555666600656 is an abundant number, since it is smaller than the sum of its proper divisors (3062912791344).

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

1555666600656 is a wasteful number, since it uses less digits than its factorization.

1555666600656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25865896 (or 25865890 counting only the distinct ones).

The product of its (nonzero) digits is 29160000, while the sum is 57.

The spelling of 1555666600656 in words is "one trillion, five hundred fifty-five billion, six hundred sixty-six million, six hundred thousand, six hundred fifty-six".