1666655556 has 24 divisors (see below), whose sum is σ = 3891605760. Its totient is φ = 555160032.

The previous prime is 1666655527. The next prime is 1666655567. The reversal of 1666655556 is 6555566661.

It is a junction number, because it is equal to n+sod(n) for n = 1666655499 and 1666655508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30991 + ... + 65526.

It is an arithmetic number, because the mean of its divisors is an integer number (162150240).

Almost surely, 2^1666655556 is an apocalyptic number.

It is an amenable number.

1666655556 is an abundant number, since it is smaller than the sum of its proper divisors (2224950204).

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

1666655556 is a wasteful number, since it uses less digits than its factorization.

1666655556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97963 (or 97961 counting only the distinct ones).

The product of its digits is 4860000, while the sum is 51.

The square root of 1666655556 is about 40824.6929688393. The cubic root of 1666655556 is about 1185.6284668604.

The spelling of 1666655556 in words is "one billion, six hundred sixty-six million, six hundred fifty-five thousand, five hundred fifty-six".