6610551666 has 8 divisors (see below), whose sum is σ = 13221103344. Its totient is φ = 2203517220.

The previous prime is 6610551599. The next prime is 6610551697. The reversal of 6610551666 is 6661550166.

It is a sphenic number, since it is the product of 3 distinct primes.

6610551666 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550879300 + ... + 550879311.

It is an arithmetic number, because the mean of its divisors is an integer number (1652637918).

Almost surely, 2^6610551666 is an apocalyptic number.

6610551666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6610551666 is a wasteful number, since it uses less digits than its factorization.

6610551666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101758616.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 6610551666 is about 81305.2991261947. The cubic root of 6610551666 is about 1876.7765482380.

The spelling of 6610551666 in words is "six billion, six hundred ten million, five hundred fifty-one thousand, six hundred sixty-six".