1611103666 has 16 divisors (see below), whose sum is σ = 2496837888. Its totient is φ = 778870800.

The previous prime is 1611103657. The next prime is 1611103667. The reversal of 1611103666 is 6663011161.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (1611103667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62221 + ... + 84223.

It is an arithmetic number, because the mean of its divisors is an integer number (156052368).

Almost surely, 2^1611103666 is an apocalyptic number.

1611103666 is a deficient number, since it is larger than the sum of its proper divisors (885734222).

1611103666 is a wasteful number, since it uses less digits than its factorization.

1611103666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23217.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1611103666 is about 40138.5558534435. Note that the first 3 decimals coincide. The cubic root of 1611103666 is about 1172.3064702109.

The spelling of 1611103666 in words is "one billion, six hundred eleven million, one hundred three thousand, six hundred sixty-six".