1678111666 has 16 divisors (see below), whose sum is σ = 3138287040. Its totient is φ = 653809680.

The previous prime is 1678111661. The next prime is 1678111693. The reversal of 1678111666 is 6661118761.

It is not an unprimeable number, because it can be changed into a prime (1678111661) 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, 5448261 + ... + 5448568.

It is an arithmetic number, because the mean of its divisors is an integer number (196142940).

Almost surely, 2^1678111666 is an apocalyptic number.

1678111666 is a deficient number, since it is larger than the sum of its proper divisors (1460175374).

1678111666 is a wasteful number, since it uses less digits than its factorization.

1678111666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10896849.

The product of its digits is 72576, while the sum is 43.

The square root of 1678111666 is about 40964.7612711218. The cubic root of 1678111666 is about 1188.3388223830.

The spelling of 1678111666 in words is "one billion, six hundred seventy-eight million, one hundred eleven thousand, six hundred sixty-six".