6555100666 has 16 divisors (see below), whose sum is σ = 10177592040. Its totient is φ = 3162700800.

The previous prime is 6555100649. The next prime is 6555100693. The reversal of 6555100666 is 6660015556.

It can be written as a sum of positive squares in 4 ways, for example, as 6420656641 + 134444025 = 80129^2 + 11595^2 .

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, 71266 + ... + 134866.

Almost surely, 2^6555100666 is an apocalyptic number.

6555100666 is a deficient number, since it is larger than the sum of its proper divisors (3622491374).

6555100666 is a wasteful number, since it uses less digits than its factorization.

6555100666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65409.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 6555100666 is about 80963.5761685463. The cubic root of 6555100666 is about 1871.5141792505.

The spelling of 6555100666 in words is "six billion, five hundred fifty-five million, one hundred thousand, six hundred sixty-six".